{"cve":"CVE-2011-1579","nvd":{"published":"2011-04-27T00:55:04.600","modified":"2026-06-16T23:29:40.157","status":"Modified","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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-20"],"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"],"products":["mediawiki:mediawiki"],"source":"nvd","synced_at":"2026-10-19T19:58:50.521460154+00:00"},"epss":{"cve":"CVE-2011-1579","score":0.01917,"percentile":0.79871,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}