CVE-2013-4523: Moodle

Low severity, CVSS 3.5. EPSS: 1% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in message/lib.php in Moodle through 2.2.11, 2.3.x before 2.3.10, 2.4.x before 2.4.7, and 2.5.x before 2.5.3 allows remote authenticated users to inject arbitrary web script or HTML via a crafted message.

Affected products

• Moodle Moodle: up to and including 2.2.11; version 1.1.1 only; version 1.2.0 only; version 1.2.1 only; version 1.3.0 only; version 1.3.1 only; …

Published 2013-11-26. Last modified 2026-06-16.