Stored cross-site scripting in Moodle - CVE-2025-26529
Published: February 18, 2025 / Updated: May 9, 2025
Vulnerability identifier: #VU104020
CSH Severity: Low
CVSS v4: 5.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N]
CVE-ID: CVE-2025-26529
CWE-ID: CWE-79
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The disclosed vulnerability allows a remote attacker to perform cross-site scripting (XSS) attacks.
The vulnerability exists due to insufficient sanitization of user-supplied data in admin live log. A remote attacker can inject and execute arbitrary HTML and script code in user's browser in context of vulnerable website.
Successful exploitation of this vulnerability may allow a remote attacker to steal potentially sensitive information, change appearance of the web page, perform phishing and drive-by-download attacks.
Affected software
Moodle
How to mitigate CVE-2025-26529
Install updates from vendor's website.
Moodle - addressed in versions 4.1.16, 4.3.10, 4.4.6, 4.5.2
Links to Public Exploits and PoC-codes
- Exploit #11366 - UNISA_CVE-2025-26529 (This repository contains a comprehensive Proof-of-Concept (PoC) scanner and exploitation framework targeting CVE-2025-26529, a critical XSS vulnerability in vulnerable Moodle instances.) (May 9, 2025)
- Exploit #11316 - PoC-CVE-2025-26529 (April 18, 2025)
- Exploit #11311 - moodleTestingEnv (April 11, 2025)