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.
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disclosed, or updated in CVE.
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