The Style Inspector in Mozilla Firefox before 17.0 and Firefox ESR 10.x before 10.0.11 does not properly restrict the context of HTML markup and Cascading Style Sheets (CSS) token sequences, which allows user-assisted remote attackers to execute arbitrary JavaScript code with chrome privileges via a crafted stylesheet.
http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00021.html
http://lists.opensuse.org/opensuse-security-announce/2013-01/msg00022.html
http://lists.opensuse.org/opensuse-updates/2012-11/msg00090.html
http://lists.opensuse.org/opensuse-updates/2012-11/msg00093.html
http://rhn.redhat.com/errata/RHSA-2012-1482.html
https://bugzilla.mozilla.org/show_bug.cgi?id=796866
http://secunia.com/advisories/51359
http://secunia.com/advisories/51369
http://secunia.com/advisories/51434
http://secunia.com/advisories/51439
https://exchange.xforce.ibmcloud.com/vulnerabilities/80182
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16833
http://www.mandriva.com/security/advisories?name=MDVSA-2012:173
http://www.mozilla.org/security/announce/2012/mfsa2012-104.html
http://www.ubuntu.com/usn/USN-1638-1