diff --git a/CHANGELOG.md b/CHANGELOG.md
index 11401f9e..15a3f502 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,13 @@ 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 the escalation form updating the ticket referenced by the submitted form data instead of the escalated ticket
+- Fix the escalation form applying the submitted ticket fields for users who are not allowed to update the ticket
+
 ## [2.9.21] - 2026-09-07
 
 ### Fixed
diff --git a/front/ticket.form.php b/front/ticket.form.php
index bbe4dcdc..6b97a90e 100644
--- a/front/ticket.form.php
+++ b/front/ticket.form.php
@@ -48,6 +48,11 @@
         Html::displayRightError();
     }
 
+    // The submitted form details are only applied when the user may update the ticket itself
+    if (!$ticket->canUpdateItem()) {
+        unset($_POST['ticket_details']);
+    }
+
     PluginEscaladeTicket::timelineClimbAction($group_id, $tickets_id, $_POST);
 
     $track = new Ticket();
diff --git a/inc/ticket.class.php b/inc/ticket.class.php
index 979627b4..9bbf3fca 100644
--- a/inc/ticket.class.php
+++ b/inc/ticket.class.php
@@ -1408,13 +1408,17 @@ public static function timelineClimbAction(int $group_id, int $tickets_id, array
                 $_form_object['status'] = $_SESSION['glpi_plugins']['escalade']['config']['ticket_last_status'];
             }
 
-            $update_data = $options['ticket_details'] + [
+            // The updated ticket must be the authorized one, never the one named by the submitted details
+            unset($options['ticket_details']['id']);
+
+            $update_data = [
+                'id' => $tickets_id,
                 '_actors' => PluginEscaladeTicket::getTicketFieldsWithActors($tickets_id, $group_id),
                 '_plugin_escalade_no_history' => true, // Prevent a duplicated task to be added
                 'actortype' => CommonITILActor::ASSIGN,
                 'groups_id' => $group_id,
                 '_form_object' => $_form_object,
-            ];
+            ] + $options['ticket_details'];
 
             // Preserve existing tags
             self::preserveExistingTags($tickets_id, $update_data);
diff --git a/tests/EscaladeTestCase.php b/tests/EscaladeTestCase.php
index 92d10218..97ee1e89 100644
--- a/tests/EscaladeTestCase.php
+++ b/tests/EscaladeTestCase.php
@@ -33,10 +33,16 @@
 use Auth;
 use Session;
 use DbTestCase;
+use Group;
 use PluginEscaladeConfig;
 
 abstract class EscaladeTestCase extends DbTestCase
 {
+    public function createGroup(string $group_name = 'TestGroup'): Group
+    {
+        return $this->createItem(Group::class, ['name' => $group_name]);
+    }
+
     protected function login(
         string $user_name = TU_USER,
         string $user_pass = TU_PASS,
diff --git a/tests/Units/EscalationAccessTest.php b/tests/Units/EscalationAccessTest.php
index d01b907e..7e725831 100644
--- a/tests/Units/EscalationAccessTest.php
+++ b/tests/Units/EscalationAccessTest.php
@@ -30,7 +30,10 @@
 
 namespace GlpiPlugin\Escalade\Tests\Units;
 
+use CommonITILActor;
 use GlpiPlugin\Escalade\Tests\EscaladeTestCase;
+use Group_Ticket;
+use PluginEscaladeTicket;
 use ProfileRight;
 use Ticket;
 
@@ -66,6 +69,55 @@ public function testAssignOnlyUserCanReachEscalationRoutes(): void
         );
     }
 
+    public function testSubmittedTicketDetailsCannotRetargetAnotherTicket(): void
+    {
+        $this->initConfig();
+        $escalated_ticket = $this->createItem(Ticket::class, ['name' => 'Escalated ticket', 'content' => '']);
+        $other_ticket = $this->createItem(Ticket::class, ['name' => 'Other ticket', 'content' => '']);
+        $group = $this->createGroup('RetargetTestGroup');
+
+        $_POST['comment'] = 'Escalation comment';
+        PluginEscaladeTicket::timelineClimbAction(
+            $group->getID(),
+            $escalated_ticket->getID(),
+            [
+                'ticket_details' => [
+                    'id'   => $other_ticket->getID(),
+                    'name' => 'Renamed by the submitted details',
+                ],
+            ],
+        );
+
+        $this->assertEquals('Other ticket', $this->loadTicket($other_ticket->getID())->fields['name']);
+        $this->assertEquals(
+            'Renamed by the submitted details',
+            $this->loadTicket($escalated_ticket->getID())->fields['name'],
+        );
+
+        $group_ticket = new Group_Ticket();
+        $this->assertTrue($group_ticket->getFromDBByCrit([
+            'tickets_id' => $escalated_ticket->getID(),
+            'groups_id'  => $group->getID(),
+            'type'       => CommonITILActor::ASSIGN,
+        ]));
+
+        unset($_POST['comment']);
+    }
+
+    public function testAssignOnlyUserCannotApplySubmittedTicketDetails(): void
+    {
+        $this->initConfig();
+        $tickets_id = $this->createItem(Ticket::class, ['name' => 'Escalation access test', 'content' => ''])->getID();
+
+        $this->setTechnicianTicketRight(Ticket::ASSIGN);
+        $this->login('tech', 'tech');
+
+        $this->assertFalse(
+            $this->loadTicket($tickets_id)->canUpdateItem(),
+            'A user with only the ASSIGN right must not have the submitted details applied to the ticket',
+        );
+    }
+
     public function testUpdateOnlyUserCannotReachEscalationRoutes(): void
     {
         $this->initConfig();