CVE-2011-1579: Mediawiki

Medium severity, CVSS 5.8. EPSS: 1.9% chance of exploitation in the next 30 days.

The checkCss function in includes/Sanitizer.php in the wikitext parser in MediaWiki before 1.16.3 does not properly validate Cascading Style Sheets (CSS) token sequences, which allows remote attackers to conduct cross-site scripting (XSS) attacks or obtain sensitive information by using the \2f\2a and \2a\2f hex strings to surround CSS comments.

Affected products

• Mediawiki Mediawiki: up to and including 1.16.2; version 1.1.0 only; version 1.2.0 only; version 1.2.1 only; version 1.2.2 only; version 1.2.3 only; …

Published 2011-04-27. Last modified 2026-06-16.