Add CSRF protections

58 files changed, 286 insertions, 131 deletions

diff --git a/app/Controller/Action.php b/app/Controller/Action.php
index 2aa85c14..11dc3b29 100644
--- a/app/Controller/Action.php
+++ b/app/Controller/Action.php
@@ -129,6 +129,7 @@ class Action extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $action = $this->action->getById($this->request->getIntegerParam('action_id'));
 
         if ($action && $this->action->remove($action['id'])) {
diff --git a/app/Controller/Base.php b/app/Controller/Base.php
index 5829fc36..9b695a82 100644
--- a/app/Controller/Base.php
+++ b/app/Controller/Base.php
@@ -3,6 +3,7 @@
 namespace Controller;
 
 use Core\Registry;
+use Core\Security;
 use Core\Translator;
 use Model\LastLogin;
 
@@ -161,6 +162,28 @@ abstract class Base
     }
 
     /**
+     * Application forbidden page
+     *
+     * @access public
+     */
+    public function forbidden()
+    {
+        $this->response->html($this->template->layout('app_forbidden', array('title' => t('Access Forbidden'))));
+    }
+
+    /**
+     * Check if the CSRF token from the URL is correct
+     *
+     * @access protected
+     */
+    protected function checkCSRFParam()
+    {
+        if (! Security::validateCSRFToken($this->request->getStringParam('csrf_token'))) {
+            $this->forbidden();
+        }
+    }
+
+    /**
      * Check if the current user have access to the given project
      *
      * @access protected
@@ -171,7 +194,7 @@ abstract class Base
         if ($this->acl->isRegularUser()) {
 
             if ($project_id > 0 && ! $this->project->isUserAllowed($project_id, $this->acl->getUserId())) {
-                $this->response->redirect('?controller=project&action=forbidden');
+                $this->forbidden();
             }
         }
     }
diff --git a/app/Controller/Board.php b/app/Controller/Board.php
index 53fdeab9..67072895 100644
--- a/app/Controller/Board.php
+++ b/app/Controller/Board.php
@@ -4,6 +4,7 @@ namespace Controller;
 
 use Model\Project as ProjectModel;
 use Model\User as UserModel;
+use Core\Security;
 
 /**
  * Board controller
@@ -20,6 +21,7 @@ class Board extends Base
      */
     public function moveUp()
     {
+        $this->checkCSRFParam();
         $project_id = $this->request->getIntegerParam('project_id');
         $column_id = $this->request->getIntegerParam('column_id');
 
@@ -35,6 +37,7 @@ class Board extends Base
      */
     public function moveDown()
     {
+        $this->checkCSRFParam();
         $project_id = $this->request->getIntegerParam('project_id');
         $column_id = $this->request->getIntegerParam('column_id');
 
@@ -344,6 +347,7 @@ class Board extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $column = $this->board->getColumn($this->request->getIntegerParam('column_id'));
 
         if ($column && $this->board->removeColumn($column['id'])) {
@@ -362,25 +366,31 @@ class Board extends Base
      */
     public function save()
     {
-        $project_id = $this->request->getIntegerParam('project_id');
-        $values = $this->request->getValues();
+        if ($this->request->isAjax()) {
 
-        if ($project_id > 0 && ! $this->project->isUserAllowed($project_id, $this->acl->getUserId())) {
-            $this->response->text('Not Authorized', 401);
-        }
+            $project_id = $this->request->getIntegerParam('project_id');
+            $values = $this->request->getValues();
 
-        if (isset($values['positions'])) {
-            $this->board->saveTasksPosition($values['positions']);
-        }
+            if ($project_id > 0 && ! $this->project->isUserAllowed($project_id, $this->acl->getUserId())) {
+                $this->response->text('Not Authorized', 401);
+            }
+
+            if (isset($values['positions'])) {
+                $this->board->saveTasksPosition($values['positions']);
+            }
 
-        $this->response->html(
-            $this->template->load('board_show', array(
-                'current_project_id' => $project_id,
-                'board' => $this->board->get($project_id),
-                'categories' => $this->category->getList($project_id, false),
-            )),
-            201
-        );
+            $this->response->html(
+                $this->template->load('board_show', array(
+                    'current_project_id' => $project_id,
+                    'board' => $this->board->get($project_id),
+                    'categories' => $this->category->getList($project_id, false),
+                )),
+                201
+            );
+        }
+        else {
+            $this->response->status(401);
+        }
     }
 
     /**
@@ -390,24 +400,30 @@ class Board extends Base
      */
     public function check()
     {
-        $project_id = $this->request->getIntegerParam('project_id');
-        $timestamp = $this->request->getIntegerParam('timestamp');
+        if ($this->request->isAjax()) {
 
-        if ($project_id > 0 && ! $this->project->isUserAllowed($project_id, $this->acl->getUserId())) {
-            $this->response->text('Not Authorized', 401);
-        }
+            $project_id = $this->request->getIntegerParam('project_id');
+            $timestamp = $this->request->getIntegerParam('timestamp');
 
-        if ($this->project->isModifiedSince($project_id, $timestamp)) {
-            $this->response->html(
-                $this->template->load('board_show', array(
-                    'current_project_id' => $project_id,
-                    'board' => $this->board->get($project_id),
-                    'categories' => $this->category->getList($project_id, false),
-                ))
-            );
+            if ($project_id > 0 && ! $this->project->isUserAllowed($project_id, $this->acl->getUserId())) {
+                $this->response->text('Not Authorized', 401);
+            }
+
+            if ($this->project->isModifiedSince($project_id, $timestamp)) {
+                $this->response->html(
+                    $this->template->load('board_show', array(
+                        'current_project_id' => $project_id,
+                        'board' => $this->board->get($project_id),
+                        'categories' => $this->category->getList($project_id, false),
+                    ))
+                );
+            }
+            else {
+                $this->response->status(304);
+            }
         }
         else {
-            $this->response->status(304);
+            $this->response->status(401);
         }
     }
 }
diff --git a/app/Controller/Category.php b/app/Controller/Category.php
index f96c1d4a..9b73f207 100644
--- a/app/Controller/Category.php
+++ b/app/Controller/Category.php
@@ -175,6 +175,7 @@ class Category extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $project = $this->getProject();
         $category = $this->getCategory($project['id']);
 
diff --git a/app/Controller/Comment.php b/app/Controller/Comment.php
index 47eaf6b6..a0a11fc8 100644
--- a/app/Controller/Comment.php
+++ b/app/Controller/Comment.php
@@ -178,6 +178,7 @@ class Comment extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $task = $this->getTask();
         $comment = $this->getComment();
 
diff --git a/app/Controller/Config.php b/app/Controller/Config.php
index b4a5b8d3..daa57790 100644
--- a/app/Controller/Config.php
+++ b/app/Controller/Config.php
@@ -76,6 +76,7 @@ class Config extends Base
      */
     public function downloadDb()
     {
+        $this->checkCSRFParam();
         $this->response->forceDownload('db.sqlite.gz');
         $this->response->binary($this->config->downloadDatabase());
     }
@@ -87,6 +88,7 @@ class Config extends Base
      */
     public function optimizeDb()
     {
+        $this->checkCSRFParam();
         $this->config->optimizeDatabase();
         $this->session->flash(t('Database optimization done.'));
         $this->response->redirect('?controller=config');
@@ -99,6 +101,7 @@ class Config extends Base
      */
     public function tokens()
     {
+        $this->checkCSRFParam();
         $this->config->regenerateTokens();
         $this->session->flash(t('All tokens have been regenerated.'));
         $this->response->redirect('?controller=config');
@@ -111,6 +114,7 @@ class Config extends Base
      */
     public function removeRememberMeToken()
     {
+        $this->checkCSRFParam();
         $this->rememberMe->remove($this->request->getIntegerParam('id'));
         $this->response->redirect('?controller=config&action=index#remember-me');
     }
diff --git a/app/Controller/File.php b/app/Controller/File.php
index 38cb82ab..3c8c32d1 100644
--- a/app/Controller/File.php
+++ b/app/Controller/File.php
@@ -111,6 +111,7 @@ class File extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $task = $this->getTask();
         $file = $this->file->getById($this->request->getIntegerParam('file_id'));
 
diff --git a/app/Controller/Project.php b/app/Controller/Project.php
index e539f364..0de67691 100644
--- a/app/Controller/Project.php
+++ b/app/Controller/Project.php
@@ -13,19 +13,6 @@ use Model\Task as TaskModel;
 class Project extends Base
 {
     /**
-     * Display access forbidden page
-     *
-     * @access public
-     */
-    public function forbidden()
-    {
-        $this->response->html($this->template->layout('project_forbidden', array(
-            'menu' => 'projects',
-            'title' => t('Access Forbidden')
-        )));
-    }
-
-    /**
      * Task search for a given project
      *
      * @access public
@@ -254,6 +241,7 @@ class Project extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $project_id = $this->request->getIntegerParam('project_id');
 
         if ($project_id && $this->project->remove($project_id)) {
@@ -272,6 +260,7 @@ class Project extends Base
      */
     public function enable()
     {
+        $this->checkCSRFParam();
         $project_id = $this->request->getIntegerParam('project_id');
 
         if ($project_id && $this->project->enable($project_id)) {
@@ -290,6 +279,7 @@ class Project extends Base
      */
     public function disable()
     {
+        $this->checkCSRFParam();
         $project_id = $this->request->getIntegerParam('project_id');
 
         if ($project_id && $this->project->disable($project_id)) {
@@ -353,6 +343,8 @@ class Project extends Base
      */
     public function revoke()
     {
+        $this->checkCSRFParam();
+
         $values = array(
             'project_id' => $this->request->getIntegerParam('project_id'),
             'user_id' => $this->request->getIntegerParam('user_id'),
diff --git a/app/Controller/Subtask.php b/app/Controller/Subtask.php
index 5ef193c8..1c217fa2 100644
--- a/app/Controller/Subtask.php
+++ b/app/Controller/Subtask.php
@@ -170,6 +170,7 @@ class Subtask extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $task = $this->getTask();
         $subtask = $this->getSubtask();
 
diff --git a/app/Controller/Task.php b/app/Controller/Task.php
index 68e3728a..d44ba268 100644
--- a/app/Controller/Task.php
+++ b/app/Controller/Task.php
@@ -218,6 +218,7 @@ class Task extends Base
      */
     public function close()
     {
+        $this->checkCSRFParam();
         $task = $this->getTask();
 
         if ($this->task->close($task['id'])) {
@@ -252,6 +253,7 @@ class Task extends Base
      */
     public function open()
     {
+        $this->checkCSRFParam();
         $task = $this->getTask();
 
         if ($this->task->open($task['id'])) {
@@ -286,6 +288,7 @@ class Task extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $task = $this->getTask();
 
         if ($this->task->remove($task['id'])) {
diff --git a/app/Controller/User.php b/app/Controller/User.php
index e3fd8253..fca33b28 100644
--- a/app/Controller/User.php
+++ b/app/Controller/User.php
@@ -11,25 +11,13 @@ namespace Controller;
 class User extends Base
 {
     /**
-     * Display access forbidden page
-     *
-     * @access public
-     */
-    public function forbidden()
-    {
-        $this->response->html($this->template->layout('user_forbidden', array(
-            'menu' => 'users',
-            'title' => t('Access Forbidden')
-        )));
-    }
-
-    /**
      * Logout and destroy session
      *
      * @access public
      */
     public function logout()
     {
+        $this->checkCSRFParam();
         $this->rememberMe->destroy($this->acl->getUserId());
         $this->session->close();
         $this->response->redirect('?controller=user&action=login');
@@ -42,7 +30,9 @@ class User extends Base
      */
     public function login()
     {
-        if (isset($_SESSION['user'])) $this->response->redirect('?controller=app');
+        if (isset($_SESSION['user'])) {
+            $this->response->redirect('?controller=app');
+        }
 
         $this->response->html($this->template->layout('user_login', array(
             'errors' => array(),
@@ -236,6 +226,7 @@ class User extends Base
      */
     public function remove()
     {
+        $this->checkCSRFParam();
         $user_id = $this->request->getIntegerParam('user_id');
 
         if ($user_id && $this->user->remove($user_id)) {
@@ -298,6 +289,7 @@ class User extends Base
      */
     public function unlinkGoogle()
     {
+        $this->checkCSRFParam();
         if ($this->google->unlink($this->acl->getUserId())) {
             $this->session->flash(t('Your Google Account is not linked anymore to your profile.'));
         }
diff --git a/app/Core/Request.php b/app/Core/Request.php
index 7e9f24ac..6bc738be 100644
--- a/app/Core/Request.php
+++ b/app/Core/Request.php
@@ -2,6 +2,8 @@
 
 namespace Core;
 
+use Core\Security;
+
 /**
  * Request class
  *
@@ -58,7 +60,12 @@ class Request
     public function getValues()
     {
         if (! empty($_POST)) {
-            return $_POST;
+
+            if (Security::validateCSRFFormToken($_POST)) {
+                return $_POST;
+            }
+
+            return array();
         }
 
         $result = json_decode($this->getBody(), true);
@@ -116,6 +123,19 @@ class Request
      */
     public function isAjax()
     {
-        return isset($_SERVER['HTTP_X_REQUESTED_WITH']) && $_SERVER['HTTP_X_REQUESTED_WITH'] === 'XMLHttpRequest';
+        return $this->getHeader('X-Requested-With') === 'XMLHttpRequest';
+    }
+
+    /**
+     * Return a HTTP header value
+     *
+     * @access public
+     * @param  string   $name   Header name
+     * @return string
+     */
+    public function getHeader($name)
+    {
+        $name = 'HTTP_'.str_replace('-', '_', strtoupper($name));
+        return isset($_SERVER[$name]) ? $_SERVER[$name] : '';
     }
 }
diff --git a/app/Core/Response.php b/app/Core/Response.php
index 11d7567a..aee029af 100644
--- a/app/Core/Response.php
+++ b/app/Core/Response.php
@@ -18,8 +18,10 @@ class Response
     public function nocache()
     {
         header('Pragma: no-cache');
-        header('Cache-Control: no-cache, must-revalidate');
         header('Expires: Sat, 26 Jul 1997 05:00:00 GMT');
+
+        // Use no-store due to a Chrome bug: https://code.google.com/p/chromium/issues/detail?id=28035
+        header('Cache-Control: no-store, must-revalidate');
     }
 
     /**
diff --git a/app/Core/Security.php b/app/Core/Security.php
new file mode 100644
index 00000000..0bd7c991
--- /dev/null
+++ b/app/Core/Security.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Core;
+
+/**
+ * Security class
+ *
+ * @package  core
+ * @author   Frederic Guillot
+ */
+class Security
+{
+     /**
+     * Generate a random token with different methods: openssl or /dev/urandom or fallback to uniqid()
+     *
+     * @static
+     * @access public
+     * @return string  Random token
+     */
+    public static function generateToken()
+    {
+        if (function_exists('openssl_random_pseudo_bytes')) {
+            return bin2hex(\openssl_random_pseudo_bytes(30));
+        }
+        else if (ini_get('open_basedir') === '' && strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
+            return hash('sha256', file_get_contents('/dev/urandom', false, null, 0, 30));
+        }
+
+        return hash('sha256', uniqid(mt_rand(), true));
+    }
+
+    /**
+     * Generate and store a CSRF token in the current session
+     *
+     * @static
+     * @access public
+     * @return string  Random token
+     */
+    public static function getCSRFToken()
+    {
+        $nonce = self::generateToken();
+
+        if (empty($_SESSION['csrf_tokens'])) {
+            $_SESSION['csrf_tokens'] = array();
+        }
+
+        $_SESSION['csrf_tokens'][$nonce] = true;
+
+        return $nonce;
+    }
+
+    /**
+     * Check if the token exists for the current session (a token can be used only one time)
+     *
+     * @static
+     * @access public
+     * @param  string   $token   CSRF token
+     * @return bool
+     */
+    public static function validateCSRFToken($token)
+    {
+        if (isset($_SESSION['csrf_tokens'][$token])) {
+            unset($_SESSION['csrf_tokens'][$token]);
+            return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Check if the token used in a form is correct and then remove the value
+     *
+     * @static
+     * @access public
+     * @param  array    $values   Form values
+     * @return bool
+     */
+    public static function validateCSRFFormToken(array &$values)
+    {
+        if (! empty($values['csrf_token']) && self::validateCSRFToken($values['csrf_token'])) {
+            unset($values['csrf_token']);
+            return true;
+        }
+
+        return false;
+    }
+}
diff --git a/app/Model/Base.php b/app/Model/Base.php
index ddc06c3d..66185aeb 100644
--- a/app/Model/Base.php
+++ b/app/Model/Base.php
@@ -55,23 +55,4 @@ abstract class Base
         $this->db = $db;
         $this->event = $event;
     }
-
-    /**
-     * Generate a random token with different methods: openssl or /dev/urandom or fallback to uniqid()
-     *
-     * @static
-     * @access public
-     * @return string  Random token
-     */
-    public static function generateToken()
-    {
-        if (function_exists('openssl_random_pseudo_bytes')) {
-            return bin2hex(\openssl_random_pseudo_bytes(16));
-        }
-        else if (ini_get('open_basedir') === '' && strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
-            return hash('sha256', file_get_contents('/dev/urandom', false, null, 0, 30));
-        }
-
-        return hash('sha256', uniqid(mt_rand(), true));
-    }
 }
diff --git a/app/Model/Config.php b/app/Model/Config.php
index 23abd8b5..469e6447 100644
--- a/app/Model/Config.php
+++ b/app/Model/Config.php
@@ -5,6 +5,7 @@ namespace Model;
 use SimpleValidator\Validator;
 use SimpleValidator\Validators;
 use Core\Translator;
+use Core\Security;
 
 /**
  * Config model
@@ -29,7 +30,7 @@ class Config extends Base
      */
     public function getTimezones()
     {
-        $timezones = \timezone_identifiers_list();
+        $timezones = timezone_identifiers_list();
         return array_combine(array_values($timezones), $timezones);
     }
 
@@ -171,12 +172,12 @@ class Config extends Base
      */
     public function regenerateTokens()
     {
-        $this->db->table(self::TABLE)->update(array('webhooks_token' => $this->generateToken()));
+        $this->db->table(self::TABLE)->update(array('webhooks_token' => Security::generateToken()));
 
         $projects = $this->db->table(Project::TABLE)->findAllByColumn('id');
 
         foreach ($projects as $project_id) {
-            $this->db->table(Project::TABLE)->eq('id', $project_id)->update(array('token' => $this->generateToken()));
+            $this->db->table(Project::TABLE)->eq('id', $project_id)->update(array('token' => Security::generateToken()));
         }
     }
 }
diff --git a/app/Model/Project.php b/app/Model/Project.php
index 9fbb0806..e1465012 100644
--- a/app/Model/Project.php
+++ b/app/Model/Project.php
@@ -5,6 +5,7 @@ namespace Model;
 use SimpleValidator\Validator;
 use SimpleValidator\Validators;
 use Event\TaskModification;
+use Core\Security;
 
 /**
  * Project model
@@ -363,7 +364,7 @@ class Project extends Base
     {
         $this->db->startTransaction();
 
-        $values['token'] = self::generateToken();
+        $values['token'] = Security::generateToken();
 
         if (! $this->db->table(self::TABLE)->save($values)) {
             $this->db->cancelTransaction();
diff --git a/app/Model/RememberMe.php b/app/Model/RememberMe.php
index 1494b14a..c9ef819f 100644
--- a/app/Model/RememberMe.php
+++ b/app/Model/RememberMe.php
@@ -2,6 +2,8 @@
 
 namespace Model;
 
+use Core\Security;
+
 /**
  * RememberMe model
  *
@@ -174,8 +176,8 @@ class RememberMe extends Base
      */
     public function create($user_id, $ip, $user_agent)
     {
-        $token = hash('sha256', $user_id.$user_agent.$ip.$this->generateToken());
-        $sequence = $this->generateToken();
+        $token = hash('sha256', $user_id.$user_agent.$ip.Security::generateToken());
+        $sequence = Security::generateToken();
         $expiration = time() + self::EXPIRATION;
 
         $this->cleanup($user_id);
@@ -225,7 +227,7 @@ class RememberMe extends Base
      */
     public function update($token, $sequence)
     {
-        $new_sequence = $this->generateToken();
+        $new_sequence = Security::generateToken();
 
         $this->db
              ->table(self::TABLE)
diff --git a/app/Schema/Mysql.php b/app/Schema/Mysql.php
index 3df38dee..5c7e256f 100644
--- a/app/Schema/Mysql.php
+++ b/app/Schema/Mysql.php
@@ -263,6 +263,6 @@ function version_1($pdo)
     $pdo->exec("
         INSERT INTO config
         (webhooks_token)
-        VALUES ('".\Model\Base::generateToken()."')
+        VALUES ('".\Core\Security::generateToken()."')
     ");
 }
diff --git a/app/Schema/Sqlite.php b/app/Schema/Sqlite.php
index 663c7d34..bfe81c13 100644
--- a/app/Schema/Sqlite.php
+++ b/app/Schema/Sqlite.php
@@ -209,7 +209,7 @@ function version_3($pdo)
 
         foreach ($results as &$result) {
             $rq = $pdo->prepare('UPDATE projects SET token=? WHERE id=?');
-            $rq->execute(array(\Model\Base::generateToken(), $result['id']));
+            $rq->execute(array(\Core\Security::generateToken(), $result['id']));
         }
     }
 }
@@ -284,6 +284,6 @@ function version_1($pdo)
     $pdo->exec("
         INSERT INTO config
         (language, webhooks_token)
-        VALUES ('en_US', '".\Model\Base::generateToken()."')
+        VALUES ('en_US', '".\Core\Security::generateToken()."')
     ");
 }
diff --git a/app/Templates/action_index.php b/app/Templates/action_index.php
index b515ccaa..36c333a9 100644
--- a/app/Templates/action_index.php
+++ b/app/Templates/action_index.php
@@ -56,7 +56,7 @@
 
     <h3><?= t('Add an action') ?></h3>
     <form method="post" action="?controller=action&amp;action=params&amp;project_id=<?= $project['id'] ?>" autocomplete="off">
-
+        <?= Helper\form_csrf() ?>
         <?= Helper\form_hidden('project_id', $values) ?>
 
         <?= Helper\form_label(t('Event'), 'event_name') ?>
diff --git a/app/Templates/action_params.php b/app/Templates/action_params.php
index 15a1d420..da685860 100644
--- a/app/Templates/action_params.php
+++ b/app/Templates/action_params.php
@@ -9,7 +9,7 @@
 
     <h3><?= t('Define action parameters') ?></h3>
     <form method="post" action="?controller=action&amp;action=create&amp;project_id=<?= $project['id'] ?>" autocomplete="off">
-
+        <?= Helper\form_csrf() ?>
         <?= Helper\form_hidden('project_id', $values) ?>
         <?= Helper\form_hidden('event_name', $values) ?>
         <?= Helper\form_hidden('action_name', $values) ?>
diff --git a/app/Templates/action_remove.php b/app/Templates/action_remove.php
index b90136e8..13679eab 100644
--- a/app/Templates/action_remove.php
+++ b/app/Templates/action_remove.php
@@ -9,7 +9,7 @@
         </p>
 
         <div class="form-actions">
-            <a href="?controller=action&amp;action=remove&amp;action_id=<?= $action['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+            <a href="?controller=action&amp;action=remove&amp;action_id=<?= $action['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
             <?= t('or') ?> <a href="?controller=action&amp;action=index&amp;project_id=<?= $action['project_id'] ?>"><?= t('cancel') ?></a>
         </div>
     </div>
diff --git a/app/Templates/user_forbidden.php b/app/Templates/app_forbidden.php
index 853159ba..0c035404 100644
--- a/app/Templates/user_forbidden.php
+++ b/app/Templates/app_forbidden.php
@@ -4,6 +4,6 @@
     </div>
 
     <p class="alert alert-error">
-        <?= t('Only administrators can access to this page.') ?>
+        <?= t('Access Forbidden') ?>
     </p>
 </section>
\ No newline at end of file
diff --git a/app/Templates/board_assign.php b/app/Templates/board_assign.php
index 74448a5c..6f92b375 100644
--- a/app/Templates/board_assign.php
+++ b/app/Templates/board_assign.php
@@ -18,7 +18,7 @@
     <section>
         <h3><?= t('Change assignee for the task "%s"', $values['title']) ?></h3>
         <form method="post" action="?controller=board&amp;action=assignTask" autocomplete="off">
-
+            <?= Helper\form_csrf() ?>
             <?= Helper\form_hidden('id', $values) ?>
             <?= Helper\form_hidden('project_id', $values) ?>
 
diff --git a/app/Templates/board_edit.php b/app/Templates/board_edit.php
index 575536a8..05d9a6f6 100644
--- a/app/Templates/board_edit.php
+++ b/app/Templates/board_edit.php
@@ -9,7 +9,7 @@
 
     <h3><?= t('Change columns') ?></h3>
     <form method="post" action="?controller=board&amp;action=update&amp;project_id=<?= $project['id'] ?>" autocomplete="off">
-
+        <?= Helper\form_csrf() ?>
         <?php $i = 0; ?>
         <table>
             <tr>
@@ -27,12 +27,12 @@
                     <ul>
                         <?php if ($column['position'] != 1): ?>
                         <li>
-                            <a href="?controller=board&amp;action=moveUp&amp;project_id=<?= $project['id'] ?>&amp;column_id=<?= $column['id'] ?>"><?= t('Move Up') ?></a>
+                            <a href="?controller=board&amp;action=moveUp&amp;project_id=<?= $project['id'] ?>&amp;column_id=<?= $column['id'].Helper\param_csrf() ?>"><?= t('Move Up') ?></a>
                         </li>
                         <?php endif ?>
                         <?php if ($column['position'] != count($columns)): ?>
                         <li>
-                            <a href="?controller=board&amp;action=moveDown&amp;project_id=<?= $project['id'] ?>&amp;column_id=<?= $column['id'] ?>"><?= t('Move Down') ?></a>
+                            <a href="?controller=board&amp;action=moveDown&amp;project_id=<?= $project['id'] ?>&amp;column_id=<?= $column['id'].Helper\param_csrf() ?>"><?= t('Move Down') ?></a>
                         </li>
                         <?php endif ?>
                         <li>
@@ -52,7 +52,7 @@
 
     <h3><?= t('Add a new column') ?></h3>
     <form method="post" action="?controller=board&amp;action=add&amp;project_id=<?= $project['id'] ?>" autocomplete="off">
-
+        <?= Helper\form_csrf() ?>
         <?= Helper\form_hidden('project_id', $values) ?>
         <?= Helper\form_label(t('Title'), 'title') ?>
         <?= Helper\form_text('title', $values, $errors, array('required')) ?>
diff --git a/app/Templates/board_remove.php b/app/Templates/board_remove.php
index b406eb38..76c217b3 100644
--- a/app/Templates/board_remove.php
+++ b/app/Templates/board_remove.php
@@ -10,7 +10,7 @@
         </p>
 
         <div class="form-actions">
-            <a href="?controller=board&amp;action=remove&amp;column_id=<?= $column['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+            <a href="?controller=board&amp;action=remove&amp;column_id=<?= $column['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
             <?= t('or') ?> <a href="?controller=board&amp;action=edit&amp;project_id=<?= $column['project_id'] ?>"><?= t('cancel') ?></a>
         </div>
     </div>
diff --git a/app/Templates/board_show.php b/app/Templates/board_show.php
index e5cd9ceb..6a138bf9 100644
--- a/app/Templates/board_show.php
+++ b/app/Templates/board_show.php
@@ -1,4 +1,4 @@
-<table id="board" data-project-id="<?= $current_project_id ?>" data-time="<?= time() ?>" data-check-interval="<?= BOARD_CHECK_INTERVAL ?>">
+<table id="board" data-project-id="<?= $current_project_id ?>" data-time="<?= time() ?>" data-check-interval="<?= BOARD_CHECK_INTERVAL ?>" data-csrf-token=<?= \Core\Security::getCSRFToken() ?>>
 <tr>
     <?php $column_with = round(100 / count($board), 2); ?>
     <?php foreach ($board as $column): ?>
diff --git a/app/Templates/category_edit.php b/app/Templates/category_edit.php
index 99ba0c7c..1339f6da 100644
--- a/app/Templates/category_edit.php
+++ b/app/Templates/category_edit.php
@@ -8,7 +8,7 @@
     <section>
 
     <form method="post" action="?controller=category&amp;action=update&amp;project_id=<?= $project['id'] ?>" autocomplete="off">
-
+        <?= Helper\form_csrf() ?>
         <?= Helper\form_hidden('id', $values) ?>
         <?= Helper\form_hidden('project_id', $values) ?>
 
diff --git a/app/Templates/category_index.php b/app/Templates/category_index.php
index db986143..7fb923ba 100644
--- a/app/Templates/category_index.php
+++ b/app/Templates/category_index.php
@@ -34,6 +34,7 @@
     <h3><?= t('Add a new category') ?></h3>
     <form method="post" action="?controller=category&amp;action=save&amp;project_id=<?= $project['id'] ?>" autocomplete="off">
 
+        <?= Helper\form_csrf() ?>
         <?= Helper\form_hidden('project_id', $values) ?>
 
         <?= Helper\form_label(t('Category Name'), 'name') ?>
diff --git a/app/Templates/category_remove.php b/app/Templates/category_remove.php
index cc2eb678..cfc23e07 100644
--- a/app/Templates/category_remove.php
+++ b/app/Templates/category_remove.php
@@ -9,7 +9,7 @@
         </p>
 
         <div class="form-actions">
-            <a href="?controller=category&amp;action=remove&amp;project_id=<?= $project['id'] ?>&amp;category_id=<?= $category['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+            <a href="?controller=category&amp;action=remove&amp;project_id=<?= $project['id'] ?>&amp;category_id=<?= $category['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
             <?= t('or') ?> <a href="?controller=category&amp;project_id=<?= $project['id'] ?>"><?= t('cancel') ?></a>
         </div>
     </div>
diff --git a/app/Templates/comment_create.php b/app/Templates/comment_create.php
index a566d9c8..f598532d 100644
--- a/app/Templates/comment_create.php
+++ b/app/Templates/comment_create.php
@@ -3,7 +3,7 @@
 </div>
 
 <form method="post" action="?controller=comment&amp;action=save&amp;task_id=<?= $task['id'] ?>" autocomplete="off">
-
+    <?= Helper\form_csrf() ?>
     <?= Helper\form_hidden('task_id', $values) ?>
     <?= Helper\form_hidden('user_id', $values) ?>
     <?= Helper\form_textarea('comment', $values, $errors, array('required', 'placeholder="'.t('Leave a comment').'"'), 'comment-textarea') ?><br/>
diff --git a/app/Templates/comment_edit.php b/app/Templates/comment_edit.php
index 0a17a95e..fdf3db54 100644
--- a/app/Templates/comment_edit.php
+++ b/app/Templates/comment_edit.php
@@ -4,6 +4,7 @@
 
 <form method="post" action="?controller=comment&amp;action=update&amp;task_id=<?= $task['id'] ?>&amp;comment_id=<?= $comment['id'] ?>" autocomplete="off">
 
+    <?= Helper\form_csrf() ?>
     <?= Helper\form_hidden('id', $values) ?>
     <?= Helper\form_textarea('comment', $values, $errors, array('required', 'placeholder="'.t('Leave a comment').'"')) ?><br/>
 
diff --git a/app/Templates/comment_remove.php b/app/Templates/comment_remove.php
index 6409d7c0..7b117781 100644
--- a/app/Templates/comment_remove.php
+++ b/app/Templates/comment_remove.php
@@ -10,7 +10,7 @@
     <?= Helper\template('comment_show', array('comment' => $comment, 'task' => $task, 'preview' => true)) ?>
 
     <div class="form-actions">
-        <a href="?controller=comment&amp;action=remove&amp;task_id=<?= $task['id'] ?>&amp;comment_id=<?= $comment['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+        <a href="?controller=comment&amp;action=remove&amp;task_id=<?= $task['id'] ?>&amp;comment_id=<?= $comment['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
         <?= t('or') ?> <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>#comment-<?= $comment['id'] ?>"><?= t('cancel') ?></a>
     </div>
 </div>
\ No newline at end of file
diff --git a/app/Templates/config_index.php b/app/Templates/config_index.php
index 6c610d2b..602e2070 100644
--- a/app/Templates/config_index.php
+++ b/app/Templates/config_index.php
@@ -7,6 +7,8 @@
         <section>
         <form method="post" action="?controller=config&amp;action=save" autocomplete="off">
 
+            <?= Helper\form_csrf() ?>
+
             <?= Helper\form_label(t('Language'), 'language') ?>
             <?= Helper\form_select('language', $languages, $values, $errors) ?><br/>
 
@@ -39,7 +41,7 @@
         </div>
         <section class="settings">
             <ul>
-                <li><a href="?controller=config&amp;action=tokens"><?= t('Reset all tokens') ?></a></li>
+                <li><a href="?controller=config&amp;action=tokens<?= Helper\param_csrf() ?>"><?= t('Reset all tokens') ?></a></li>
                 <li>
                     <?= t('Webhooks token:') ?>
                     <strong><?= Helper\escape($values['webhooks_token']) ?></strong>
@@ -50,11 +52,11 @@
                         <strong><?= Helper\format_bytes($db_size) ?></strong>
                     </li>
                     <li>
-                        <a href="?controller=config&amp;action=downloadDb"><?= t('Download the database') ?></a>
+                        <a href="?controller=config&amp;action=downloadDb<?= Helper\param_csrf() ?>"><?= t('Download the database') ?></a>
                         <?= t('(Gzip compressed Sqlite file)') ?>
                     </li>
                     <li>
-                        <a href="?controller=config&amp;action=optimizeDb"><?= t('Optimize the database') ?></a>
+                        <a href="?controller=config&amp;action=optimizeDb <?= Helper\param_csrf() ?>"><?= t('Optimize the database') ?></a>
                          <?= t('(VACUUM command)') ?>
                     </li>
                 <?php endif ?>
@@ -112,7 +114,7 @@
             <td><?= dt('%B %e, %G at %k:%M %p', $session['expiration']) ?></td>
             <td><?= Helper\escape($session['ip']) ?></td>
             <td><?= Helper\escape($session['user_agent']) ?></td>
-            <td><a href="?controller=config&amp;action=removeRememberMeToken&amp;id=<?= $session['id'] ?>"><?= t('Remove') ?></a></td>
+            <td><a href="?controller=config&amp;action=removeRememberMeToken&amp;id=<?= $session['id'].Helper\param_csrf() ?>"><?= t('Remove') ?></a></td>
         </tr>
         <?php endforeach ?>
         </table>
diff --git a/app/Templates/file_new.php b/app/Templates/file_new.php
index 643f340d..7f7f1d1c 100644
--- a/app/Templates/file_new.php
+++ b/app/Templates/file_new.php
@@ -3,6 +3,7 @@
 </div>
 
 <form action="?controller=file&amp;action=save&amp;task_id=<?= $task['id'] ?>" method="post" enctype="multipart/form-data">
+    <?= Helper\form_csrf() ?>
     <input type="file" name="files[]" multiple />
     <div class="form-help"><?= t('Maximum size: ') ?><?= is_integer($max_size) ? Helper\format_bytes($max_size) : $max_size ?></div>
     <div class="form-actions">
diff --git a/app/Templates/file_remove.php b/app/Templates/file_remove.php
index 1d26c15e..af77591c 100644
--- a/app/Templates/file_remove.php
+++ b/app/Templates/file_remove.php
@@ -8,7 +8,7 @@
     </p>
 
     <div class="form-actions">
-        <a href="?controller=file&amp;action=remove&amp;task_id=<?= $task['id'] ?>&amp;file_id=<?= $file['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+        <a href="?controller=file&amp;action=remove&amp;task_id=<?= $task['id'] ?>&amp;file_id=<?= $file['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
         <?= t('or') ?> <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>"><?= t('cancel') ?></a>
     </div>
 </div>
\ No newline at end of file
diff --git a/app/Templates/layout.php b/app/Templates/layout.php
index 3e3b2e89..aa430477 100644
--- a/app/Templates/layout.php
+++ b/app/Templates/layout.php
@@ -45,7 +45,7 @@
                         <a href="?controller=config"><?= t('Settings') ?></a>
                     </li>
                     <li>
-                        <a href="?controller=user&amp;action=logout"><?= t('Logout') ?></a>
+                        <a href="?controller=user&amp;action=logout<?= Helper\param_csrf() ?>"><?= t('Logout') ?></a>
                         (<?= Helper\escape(Helper\get_username()) ?>)
                     </li>
                 </ul>
diff --git a/app/Templates/project_edit.php b/app/Templates/project_edit.php
index 557986bf..a882fbc6 100644
--- a/app/Templates/project_edit.php
+++ b/app/Templates/project_edit.php
@@ -8,6 +8,7 @@
     <section>
     <form method="post" action="?controller=project&amp;action=update&amp;project_id=<?= $values['id'] ?>" autocomplete="off">
 
+        <?= Helper\form_csrf() ?>
         <?= Helper\form_hidden('id', $values) ?>
 
         <?= Helper\form_label(t('Name'), 'name') ?>
diff --git a/app/Templates/project_forbidden.php b/app/Templates/project_forbidden.php
deleted file mode 100644
index 1cba7b58..00000000
--- a/app/Templates/project_forbidden.php
+++ /dev/null
@@ -1,9 +0,0 @@
-<section id="main">
-    <div class="page-header">
-        <h2><?= t('Forbidden') ?></h2>
-    </div>
-
-    <p class="alert alert-error">
-        <?= t('You are not allowed to access to this project.') ?>
-    </p>
-</section>
\ No newline at end of file
diff --git a/app/Templates/project_index.php b/app/Templates/project_index.php
index 1a3dbd49..927924a5 100644
--- a/app/Templates/project_index.php
+++ b/app/Templates/project_index.php
@@ -78,9 +78,9 @@
                         </li>
                         <li>
                             <?php if ($project['is_active']): ?>
-                                <a href="?controller=project&amp;action=disable&amp;project_id=<?= $project['id'] ?>"><?= t('Disable') ?></a>
+                                <a href="?controller=project&amp;action=disable&amp;project_id=<?= $project['id'].Helper\param_csrf() ?>"><?= t('Disable') ?></a>
                             <?php else: ?>
-                                <a href="?controller=project&amp;action=enable&amp;project_id=<?= $project['id'] ?>"><?= t('Enable') ?></a>
+                                <a href="?controller=project&amp;action=enable&amp;project_id=<?= $project['id'].Helper\param_csrf() ?>"><?= t('Enable') ?></a>
                             <?php endif ?>
                         </li>
                         <li>
diff --git a/app/Templates/project_new.php b/app/Templates/project_new.php
index 2026d461..b4ed9990 100644
--- a/app/Templates/project_new.php
+++ b/app/Templates/project_new.php
@@ -8,6 +8,7 @@
     <section>
     <form method="post" action="?controller=project&amp;action=save" autocomplete="off">
 
+        <?= Helper\form_csrf() ?>
         <?= Helper\form_label(t('Name'), 'name') ?>
         <?= Helper\form_text('name', $values, $errors, array('autofocus', 'required')) ?>
 
diff --git a/app/Templates/project_remove.php b/app/Templates/project_remove.php
index e9f213b5..e25efa2f 100644
--- a/app/Templates/project_remove.php
+++ b/app/Templates/project_remove.php
@@ -9,7 +9,7 @@
         </p>
 
         <div class="form-actions">
-            <a href="?controller=project&amp;action=remove&amp;project_id=<?= $project['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+            <a href="?controller=project&amp;action=remove&amp;project_id=<?= $project['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
             <?= t('or') ?> <a href="?controller=project"><?= t('cancel') ?></a>
         </div>
     </div>
diff --git a/app/Templates/project_users.php b/app/Templates/project_users.php
index 0448004f..8afac709 100644
--- a/app/Templates/project_users.php
+++ b/app/Templates/project_users.php
@@ -10,6 +10,8 @@
     <?php if (! empty($users['not_allowed'])): ?>
         <form method="post" action="?controller=project&amp;action=allow&amp;project_id=<?= $project['id'] ?>" autocomplete="off">
 
+            <?= Helper\form_csrf() ?>
+
             <?= Helper\form_hidden('project_id', array('project_id' => $project['id'])) ?>
 
             <?= Helper\form_label(t('User'), 'user_id') ?>
@@ -32,7 +34,7 @@
         <?php foreach ($users['allowed'] as $user_id => $username): ?>
             <li>
                 <strong><?= Helper\escape($username) ?></strong>
-                (<a href="?controller=project&amp;action=revoke&amp;project_id=<?= $project['id'] ?>&amp;user_id=<?= $user_id ?>"><?= t('revoke') ?></a>)
+                (<a href="?controller=project&amp;action=revoke&amp;project_id=<?= $project['id'] ?>&amp;user_id=<?= $user_id.Helper\param_csrf() ?>"><?= t('revoke') ?></a>)
             </li>
         <?php endforeach ?>
         </ul>
diff --git a/app/Templates/subtask_create.php b/app/Templates/subtask_create.php
index a456aa37..f1b27ab9 100644
--- a/app/Templates/subtask_create.php
+++ b/app/Templates/subtask_create.php
@@ -4,6 +4,8 @@
 
 <form method="post" action="?controller=subtask&amp;action=save&amp;task_id=<?= $task['id'] ?>" autocomplete="off">
 
+    <?= Helper\form_csrf() ?>
+
     <?= Helper\form_hidden('task_id', $values) ?>
 
     <?= Helper\form_label(t('Title'), 'title') ?>
diff --git a/app/Templates/subtask_edit.php b/app/Templates/subtask_edit.php
index 3080cdad..fc65d3b3 100644
--- a/app/Templates/subtask_edit.php
+++ b/app/Templates/subtask_edit.php
@@ -4,6 +4,8 @@
 
 <form method="post" action="?controller=subtask&amp;action=update&amp;task_id=<?= $task['id'] ?>&amp;subtask_id=<?= $subtask['id'] ?>" autocomplete="off">
 
+    <?= Helper\form_csrf() ?>
+
     <?= Helper\form_hidden('id', $values) ?>
     <?= Helper\form_hidden('task_id', $values) ?>
 
diff --git a/app/Templates/subtask_remove.php b/app/Templates/subtask_remove.php
index 2862176c..12c99cf1 100644
--- a/app/Templates/subtask_remove.php
+++ b/app/Templates/subtask_remove.php
@@ -10,7 +10,7 @@
     <p><strong><?= Helper\escape($subtask['title']) ?></strong></p>
 
     <div class="form-actions">
-        <a href="?controller=subtask&amp;action=remove&amp;task_id=<?= $task['id'] ?>&amp;subtask_id=<?= $subtask['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+        <a href="?controller=subtask&amp;action=remove&amp;task_id=<?= $task['id'] ?>&amp;subtask_id=<?= $subtask['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
         <?= t('or') ?> <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>#subtasks"><?= t('cancel') ?></a>
     </div>
 </div>
\ No newline at end of file
diff --git a/app/Templates/task_close.php b/app/Templates/task_close.php
index 6843c2f6..5c75b72b 100644
--- a/app/Templates/task_close.php
+++ b/app/Templates/task_close.php
@@ -8,7 +8,7 @@
     </p>
 
     <div class="form-actions">
-        <a href="?controller=task&amp;action=close&amp;task_id=<?= $task['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+        <a href="?controller=task&amp;action=close&amp;task_id=<?= $task['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
         <?= t('or') ?> <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>"><?= t('cancel') ?></a>
     </div>
 </div>
\ No newline at end of file
diff --git a/app/Templates/task_edit.php b/app/Templates/task_edit.php
index d698c21d..c03c7d9a 100644
--- a/app/Templates/task_edit.php
+++ b/app/Templates/task_edit.php
@@ -8,6 +8,8 @@
     <section>
     <form method="post" action="?controller=task&amp;action=update&amp;task_id=<?= $task['id'] ?>" autocomplete="off">
 
+        <?= Helper\form_csrf() ?>
+
         <div class="form-column">
 
             <?= Helper\form_label(t('Title'), 'title') ?>
diff --git a/app/Templates/task_edit_description.php b/app/Templates/task_edit_description.php
index 0bdc40a2..550dac73 100644
--- a/app/Templates/task_edit_description.php
+++ b/app/Templates/task_edit_description.php
@@ -4,6 +4,8 @@
 
 <form method="post" action="?controller=task&amp;action=saveDescription&amp;task_id=<?= $task['id'] ?>" autocomplete="off">
 
+    <?= Helper\form_csrf() ?>
+
     <?= Helper\form_hidden('id', $values) ?>
     <?= Helper\form_textarea('description', $values, $errors, array('required', 'placeholder="'.t('Leave a description').'"'), 'description-textarea') ?><br/>
     <div class="form-help"><a href="http://kanboard.net/documentation/syntax-guide" target="_blank" rel="noreferrer"><?= t('Write your text in Markdown') ?></a></div>
diff --git a/app/Templates/task_new.php b/app/Templates/task_new.php
index d233efd2..2938c4ca 100644
--- a/app/Templates/task_new.php
+++ b/app/Templates/task_new.php
@@ -5,6 +5,8 @@
     <section>
     <form method="post" action="?controller=task&amp;action=save" autocomplete="off">
 
+        <?= Helper\form_csrf() ?>
+
         <div class="form-column">
             <?= Helper\form_label(t('Title'), 'title') ?>
             <?= Helper\form_text('title', $values, $errors, array('autofocus', 'required')) ?><br/>
diff --git a/app/Templates/task_open.php b/app/Templates/task_open.php
index 59ea0b54..3526ec81 100644
--- a/app/Templates/task_open.php
+++ b/app/Templates/task_open.php
@@ -8,7 +8,7 @@
     </p>
 
     <div class="form-actions">
-        <a href="?controller=task&amp;action=open&amp;task_id=<?= $task['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+        <a href="?controller=task&amp;action=open&amp;task_id=<?= $task['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
         <?= t('or') ?> <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>"><?= t('cancel') ?></a>
     </div>
 </div>
\ No newline at end of file
diff --git a/app/Templates/task_remove.php b/app/Templates/task_remove.php
index 60e4e8e7..dd4841db 100644
--- a/app/Templates/task_remove.php
+++ b/app/Templates/task_remove.php
@@ -8,7 +8,7 @@
     </p>
 
     <div class="form-actions">
-        <a href="?controller=task&amp;action=remove&amp;task_id=<?= $task['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+        <a href="?controller=task&amp;action=remove&amp;task_id=<?= $task['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
         <?= t('or') ?> <a href="?controller=task&amp;action=show&amp;task_id=<?= $task['id'] ?>"><?= t('cancel') ?></a>
     </div>
 </div>
\ No newline at end of file
diff --git a/app/Templates/user_edit.php b/app/Templates/user_edit.php
index c857fe1c..6b83f748 100644
--- a/app/Templates/user_edit.php
+++ b/app/Templates/user_edit.php
@@ -8,6 +8,8 @@
     <section>
     <form method="post" action="?controller=user&amp;action=update" autocomplete="off">
 
+        <?= Helper\form_csrf() ?>
+
         <div class="form-column">
 
             <?= Helper\form_hidden('id', $values) ?>
@@ -48,9 +50,9 @@
 
             <?php if (GOOGLE_AUTH && Helper\is_current_user($values['id'])): ?>
                 <?php if (empty($values['google_id'])): ?>
-                    <a href="?controller=user&amp;action=google"><?= t('Link my Google Account') ?></a>
+                    <a href="?controller=user&amp;action=google<?= Helper\param_csrf() ?>"><?= t('Link my Google Account') ?></a>
                 <?php else: ?>
-                    <a href="?controller=user&amp;action=unlinkGoogle"><?= t('Unlink my Google Account') ?></a>
+                    <a href="?controller=user&amp;action=unlinkGoogle<?= Helper\param_csrf() ?>"><?= t('Unlink my Google Account') ?></a>
                 <?php endif ?>
             <?php endif ?>
 
diff --git a/app/Templates/user_login.php b/app/Templates/user_login.php
index 878170e3..49902ebb 100644
--- a/app/Templates/user_login.php
+++ b/app/Templates/user_login.php
@@ -8,6 +8,8 @@
 
 <form method="post" action="?controller=user&amp;action=check" class="form-login">
 
+    <?= Helper\form_csrf() ?>
+
     <?= Helper\form_label(t('Username'), 'username') ?>
     <?= Helper\form_text('username', $values, $errors, array('autofocus', 'required')) ?><br/>
 
diff --git a/app/Templates/user_new.php b/app/Templates/user_new.php
index 6ad976f2..3e22b7ee 100644
--- a/app/Templates/user_new.php
+++ b/app/Templates/user_new.php
@@ -8,6 +8,8 @@
     <section>
     <form method="post" action="?controller=user&amp;action=save" autocomplete="off">
 
+        <?= Helper\form_csrf() ?>
+
         <div class="form-column">
 
             <?= Helper\form_label(t('Username'), 'username') ?>
diff --git a/app/Templates/user_remove.php b/app/Templates/user_remove.php
index a4db2e4a..61d4163b 100644
--- a/app/Templates/user_remove.php
+++ b/app/Templates/user_remove.php
@@ -7,7 +7,7 @@
         <p class="alert alert-info"><?= t('Do you really want to remove this user: "%s"?', $user['username']) ?></p>
 
         <div class="form-actions">
-            <a href="?controller=user&amp;action=remove&amp;user_id=<?= $user['id'] ?>" class="btn btn-red"><?= t('Yes') ?></a>
+            <a href="?controller=user&amp;action=remove&amp;user_id=<?= $user['id'].Helper\param_csrf() ?>" class="btn btn-red"><?= t('Yes') ?></a>
             <?= t('or') ?> <a href="?controller=user"><?= t('cancel') ?></a>
         </div>
     </div>
diff --git a/app/helpers.php b/app/helpers.php
index d22a4869..2df4d839 100644
--- a/app/helpers.php
+++ b/app/helpers.php
@@ -2,6 +2,11 @@
 
 namespace Helper;
 
+function param_csrf()
+{
+    return '&amp;csrf_token='.\Core\Security::getCSRFToken();
+}
+
 function js($filename)
 {
     return '<script type="text/javascript" src="'.$filename.'?'.filemtime($filename).'"></script>';
@@ -163,6 +168,11 @@ function form_value($values, $name)
     return isset($values[$name]) ? 'value="'.escape($values[$name]).'"' : '';
 }
 
+function form_csrf()
+{
+    return '<input type="hidden" name="csrf_token" value="'.\Core\Security::getCSRFToken().'"/>';
+}
+
 function form_hidden($name, $values = array())
 {
     return '<input type="hidden" name="'.$name.'" id="form-'.$name.'" '.form_value($values, $name).'/>';