Open Redirect Vulnerability in Catalyst User Key Authentication Plugin for Moodle
CVE-2025-4513

5.3MEDIUM

Key Information:

Vendor: Catalyst
Status: User Key Authentication Plugin
Vendor: CVE Published:; 10 May 2025

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👾 Exploit Exists🟡 Public PoC

What is CVE-2025-4513?

A security vulnerability exists in the Catalyst User Key Authentication Plugin for Moodle, specifically impacting the logout.php file. This issue allows attackers to manipulate the return argument, which can lead to an open redirect. Such an exploit can be launched remotely, making it a potential risk for users. Despite prior disclosure attempts to the vendor, there has been no response, highlighting the importance of addressing this vulnerability to secure Moodle environments.

Affected Version(s)

User Key Authentication Plugin 20220819

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2025-4513 - Proof of Concept