CVE-2013-4939: Moodle

Medium severity, CVSS 4.3. EPSS: 1.5% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in io.swf in the IO Utility component in Yahoo! YUI 3.0.0 through 3.9.1, as used in Moodle through 2.1.10, 2.2.x before 2.2.11, 2.3.x before 2.3.8, 2.4.x before 2.4.5, 2.5.x before 2.5.1, and other products, allows remote attackers to inject arbitrary web script or HTML via a crafted string in a URL.

Affected products

• Moodle Moodle: version 2.1.0 only; version 2.1.1 only; version 2.1.2 only; version 2.1.3 only; version 2.1.4 only; version 2.1.5 only; …
• Yahoo Yui: version 3.0.0 only; version 3.1.0 only; version 3.1.1 only; version 3.1.2 only; version 3.2.0 only; version 3.3.0 only; …

Published 2013-07-29. Last modified 2026-06-16.