Catalyst User Key Authentication Plugin 20220819 on Moodle Logout /auth/userkey/logout.php return redirect

Summaryinfo

A vulnerability identified as problematic has been detected in Catalyst User Key Authentication Plugin 20220819 on Moodle. This affects an unknown part of the file /auth/userkey/logout.php of the component Logout. This manipulation of the argument return causes redirect. This vulnerability appears as CVE-2025-4513. The attack may be initiated remotely. In addition, an exploit is available. The vendor was contacted early about this disclosure but did not respond in any way.

Detailsinfo

A vulnerability classified as problematic was found in Catalyst User Key Authentication Plugin 20220819 on Moodle. Affected by this vulnerability is some unknown functionality of the file /auth/userkey/logout.php of the component Logout. The manipulation of the argument return with an unknown input leads to a redirect vulnerability. The CWE definition for the vulnerability is CWE-601. A web application accepts a user-controlled input that specifies a link to an external site, and uses that link in a Redirect. This simplifies phishing attacks. As an impact it is known to affect integrity.

The advisory is shared at github.com. This vulnerability is known as CVE-2025-4513. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. It demands that the victim is doing some kind of user interaction. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1204.001 for this issue.

It is possible to download the exploit at github.com. It is declared as proof-of-concept. The vendor was contacted early about this disclosure but did not respond in any way. By approaching the search of inurl:auth/userkey/logout.php it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Catalyst

Name

• User Key Authentication Plugin

Version

• 20220819

CPE 2.3info

• 🔍

CPE 2.2info

• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Submitinfo

Accepted

• Submit #564090: Catalyst IT Australia User key authentication 2022081901 Open Redirect (by github.com)

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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