Incomplete blacklist vulnerability in Sanitizer::checkCss in MediaWiki before 1.19.9, 1.20.x before 1.20.8, and 1.21.x before 1.21.3 allows remote attackers to conduct cross-site scripting (XSS) attacks via a \b (backspace) character in CSS.
lists.fedoraproject.org/pipermail/package-announce/2013-December/122998.html
lists.fedoraproject.org/pipermail/package-announce/2013-December/123011.html
lists.wikimedia.org/pipermail/mediawiki-announce/2013-November/000135.html
secunia.com/advisories/57472
www.debian.org/security/2014/dsa-2891
www.securityfocus.com/bid/63760
bugzilla.wikimedia.org/show_bug.cgi?id=55332