An unspecified parser-utility class in Mozilla Firefox 4.x through 13.0, Firefox ESR 10.x before 10.0.6, Thunderbird 5.0 through 13.0, Thunderbird ESR 10.x before 10.0.6, and SeaMonkey before 2.11 does not properly handle EMBED elements within description elements in RSS feeds, which allows remote attackers to conduct cross-site scripting (XSS) attacks via a feed.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A16844
https://bugzilla.mozilla.org/show_bug.cgi?id=750096
http://www.ubuntu.com/usn/USN-1510-1
http://www.ubuntu.com/usn/USN-1509-2
http://www.ubuntu.com/usn/USN-1509-1
http://www.securitytracker.com/id?1027258
http://www.securitytracker.com/id?1027257
http://www.securitytracker.com/id?1027256
http://www.securityfocus.com/bid/54583
http://www.mozilla.org/security/announce/2012/mfsa2012-47.html
http://secunia.com/advisories/49994
http://secunia.com/advisories/49993
http://secunia.com/advisories/49992
http://secunia.com/advisories/49979
http://secunia.com/advisories/49977
http://secunia.com/advisories/49972
http://secunia.com/advisories/49968
http://secunia.com/advisories/49965
http://rhn.redhat.com/errata/RHSA-2012-1088.html
http://lists.opensuse.org/opensuse-security-announce/2012-07/msg00016.html
http://lists.opensuse.org/opensuse-security-announce/2012-07/msg00013.html
http://lists.opensuse.org/opensuse-security-announce/2012-07/msg00012.html
http://lists.opensuse.org/opensuse-security-announce/2012-07/msg00011.html