CVE-2025-4513 | Catalyst User Key Authentication Plugin 20220819 on Moodle Logout /auth/userkey/logout.php return redirect

A vulnerability classified as problematic was found in Catalyst User Key Authentication Plugin 20220819 on Moodle. Affected by this vulnerability is an unknown functionality of the file /auth/userkey/logout.php of the component Logout. The manipulation of the argument return leads to open redirect.

This vulnerability is known as CVE-2025-4513. The attack can be launched remotely. Furthermore, there is an exploit available.

The vendor was contacted early about this disclosure but did not respond in any way.