CVE-2026-102581: Moodle

Medium severity, CVSS 5.4. EPSS: 0.2% chance of exploitation in the next 30 days.

A flaw was found in Moodle. Insufficient output escaping in templates used to display forum posts enables a stored cross-site scripting (XSS) vulnerability. An attacker can inject malicious content into a forum post, which then executes arbitrary script code in the browser of another user viewing the affected post.

Affected products

• Moodle Moodle: before 4.5.13 (fixed in 4.5.13); from 5.0.0, before 5.0.9 (fixed in 5.0.9); from 5.1.0, before 5.1.6 (fixed in 5.1.6); from 5.2.0, before 5.2.2 (fixed in 5.2.2)

Published 2026-09-30. Last modified 2026-10-01.