CVE-2011-1579

Severity: medium (CVSS 5.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2011-04-27 · updated 2026-06-16
Weakness: CWE-20

Description

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

Wikimedia Foundation MediaWiki: through 1.16.2; 1.1.0, 1.2.0, 1.2.1, 1.2.2, 1.2.3, 1.2.4 (+128)

References

http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058588.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/058910.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/059232.html
http://lists.fedoraproject.org/pipermail/package-announce/2011-April/059235.html
http://lists.wikimedia.org/pipermail/mediawiki-announce/2011-April/000096.html
http://openwall.com/lists/oss-security/2011/04/13/15
http://secunia.com/advisories/44142
http://www.debian.org/security/2011/dsa-2366
http://www.mediawiki.org/wiki/Special:Code/MediaWiki/85856
http://www.securityfocus.com/bid/47354
http://www.vupen.com/english/advisories/2011/0978
http://www.vupen.com/english/advisories/2011/1100

Get alerted when CVE-2011-1579 or the next vulnerability affects your stack