CVE-2011-0508: Contao CMS

Medium severity, CVSS 4.3. EPSS: 1.9% chance of exploitation in the next 30 days.

Cross-site scripting (XSS) vulnerability in system/modules/comments/Comments.php in Contao CMS 2.9.2, and possibly other versions before 2.9.3, allows remote attackers to inject arbitrary web script or HTML via the HTTP X_FORWARDED_FOR header, which is stored by system/libraries/Environment.php but not properly handled by a comments action to main.php.

Affected products

• Contao Contao CMS: version 2.9.2 only

Published 2011-01-20. Last modified 2026-06-16.