The garbage-collection implementation in Mozilla Firefox before 3.0.11, Thunderbird before 2.0.0.22, and SeaMonkey before 1.1.17 sets an element's owner document to null in unspecified circumstances, which allows remote attackers to execute arbitrary JavaScript with chrome privileges via a crafted event handler, related to an incorrect context for this event handler.
http://rhn.redhat.com/errata/RHSA-2009-1096.html
https://bugzilla.mozilla.org/show_bug.cgi?id=489131
https://bugzilla.redhat.com/show_bug.cgi?id=503580
http://secunia.com/advisories/35331
http://secunia.com/advisories/35415
http://secunia.com/advisories/35428
http://secunia.com/advisories/35431
http://secunia.com/advisories/35439
http://secunia.com/advisories/35440
http://secunia.com/advisories/35468
http://secunia.com/advisories/35536
http://secunia.com/advisories/35561
http://secunia.com/advisories/35602
http://secunia.com/advisories/35882
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A11080
https://rhn.redhat.com/errata/RHSA-2009-1095.html
http://sunsolve.sun.com/search/document.do?assetkey=1-66-264308-1
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00444.html
https://www.redhat.com/archives/fedora-package-announce/2009-July/msg00504.html
https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00574.html
https://www.redhat.com/archives/fedora-package-announce/2009-June/msg00657.html
http://www.debian.org/security/2009/dsa-1820
http://www.debian.org/security/2009/dsa-1830
http://www.mandriva.com/security/advisories?name=MDVSA-2009:141
http://www.mozilla.org/security/announce/2009/mfsa2009-29.html
http://www.redhat.com/support/errata/RHSA-2009-1125.html
http://www.redhat.com/support/errata/RHSA-2009-1126.html
http://www.securitytracker.com/id?1022397