diff --git a/CHANGELOG.md b/CHANGELOG.md
index aa96cbb..0f7860a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [Unreleased]
+
+### Fixed
+
+- Fix errors in rights checks during escalation
+
 ## [2.10.5] - 2026-07-28
 
 ### Fixed
diff --git a/ajax/assign_me.php b/ajax/assign_me.php
deleted file mode 100644
index 59f5fea..0000000
--- a/ajax/assign_me.php
+++ /dev/null
@@ -1,44 +0,0 @@
-<?php
-
-/**
- * -------------------------------------------------------------------------
- * Escalade plugin for GLPI
- * -------------------------------------------------------------------------
- *
- * LICENSE
- *
- * This file is part of Escalade.
- *
- * Escalade is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * Escalade is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Escalade. If not, see <http://www.gnu.org/licenses/>.
- * -------------------------------------------------------------------------
- * @copyright Copyright (C) 2015-2023 by Escalade plugin team.
- * @license   GPLv2 https://www.gnu.org/licenses/gpl-2.0.html
- * @link      https://github.com/pluginsGLPI/escalade
- * -------------------------------------------------------------------------
- */
-
-use Glpi\Exception\Http\BadRequestHttpException;
-
-Session::checkLoginUser();
-
-if (! isset($_REQUEST['tickets_id'])) {
-    throw new BadRequestHttpException();
-}
-
-$tickets_id = (int) $_REQUEST['tickets_id'];
-
-$ticket = new Ticket();
-$ticket->check($tickets_id, Ticket::ASSIGN);
-
-PluginEscaladeTicket::assign_me($tickets_id);
diff --git a/front/climb_group.php b/front/climb_group.php
index 6ba2fc6..7cac026 100644
--- a/front/climb_group.php
+++ b/front/climb_group.php
@@ -29,6 +29,7 @@
  */
 
 use Glpi\Exception\Http\BadRequestHttpException;
+use Glpi\Exception\Http\AccessDeniedHttpException;
 
 Session::checkLoginUser();
 
@@ -47,6 +48,8 @@
 $tickets_id = (int) $_REQUEST['tickets_id'];
 
 $ticket = new Ticket();
-$ticket->check($tickets_id, Ticket::ASSIGN);
+if (!$ticket->getFromDB($tickets_id) || !$ticket->canAssign()) {
+    throw new AccessDeniedHttpException();
+}
 
 PluginEscaladeTicket::climb_group($tickets_id, (int) $_REQUEST['groups_id']);
diff --git a/front/ticket.form.php b/front/ticket.form.php
index 42afcb5..cfd9ad4 100644
--- a/front/ticket.form.php
+++ b/front/ticket.form.php
@@ -28,6 +28,8 @@
  * -------------------------------------------------------------------------
  */
 
+use Glpi\Exception\Http\AccessDeniedHttpException;
+
 Session::checkLoginUser();
 
 /** @var array $CFG_GLPI */
@@ -38,7 +40,9 @@
     $tickets_id = (int) $_POST['tickets_id'];
 
     $ticket = new Ticket();
-    $ticket->check($tickets_id, Ticket::ASSIGN);
+    if (!$ticket->getFromDB($tickets_id) || !$ticket->canAssign()) {
+        throw new AccessDeniedHttpException();
+    }
 
     PluginEscaladeTicket::timelineClimbAction($group_id, $tickets_id, $_POST);
 
diff --git a/inc/ticket.class.php b/inc/ticket.class.php
index 0b9beb0..b39f5bc 100644
--- a/inc/ticket.class.php
+++ b/inc/ticket.class.php
@@ -1102,29 +1102,6 @@ public static function cloneAndLink($tickets_id)
         echo sprintf('{"success":true, "newID":%s}', $newID);
     }
 
-
-    public static function assign_me($tickets_id)
-    {
-
-        $tu = new Ticket_User();
-        $found = $tu->find([
-            'tickets_id' => $tickets_id,
-            'users_id'   => $_SESSION['glpiID'],
-            'type'       => CommonITILActor::ASSIGN,
-        ]);
-
-        if (empty($found)) {
-            $ticket = new Ticket();
-            $ticket->update([
-                'id'           => $tickets_id,
-                '_itil_assign' => [
-                    'users_id' => $_SESSION['glpiID'],
-                    '_type'    => 'user',
-                ],
-            ]);
-        }
-    }
-
     public static function filter_actors(array $params = []): array
     {
         $itemtype = $params['params']['itemtype'];