CVE-2025-26529

CVE-2025-26529 is a stored Cross-Site Scripting (XSS) vulnerability found in Moodle's site administration live log functionality. The vulnerability exists because description information displayed in the site administration live log was not properly sanitized. This flaw affects Moodle versions 4.5 to 4.5.1, 4.4 to 4.4.5, 4.3 to 4.3.9, 4.1 to 4.1.15, and earlier unsupported versions. Successful exploitation of this vulnerability could allow attackers to inject malicious scripts that would be executed in the context of other users' browsers when they view the affected live log section in the site administration area. To remediate this vulnerability, users are advised to upgrade to the patched versions: Moodle 4.5.2, 4.4.6, 4.3.10, and 4.1.16. The fix involves implementing proper sanitization for event descriptions in the live log functionality.