Mozilla Firefox before 3.0.9, Thunderbird, and SeaMonkey do not properly implement the Same Origin Policy for (1) XMLHttpRequest, involving a mismatch for a document's principal, and (2) XPCNativeWrapper.toString, involving an incorrect __proto__ scope, which allows remote attackers to conduct cross-site scripting (XSS) attacks and possibly other attacks via a crafted document.
http://lists.opensuse.org/opensuse-security-announce/2009-05/msg00000.html
http://rhn.redhat.com/errata/RHSA-2009-0437.html
https://bugzilla.mozilla.org/show_bug.cgi?id=478433
https://bugzilla.mozilla.org/show_bug.cgi?id=482206
http://secunia.com/advisories/34758
http://secunia.com/advisories/34780
http://secunia.com/advisories/34843
http://secunia.com/advisories/34844
http://secunia.com/advisories/34894
http://secunia.com/advisories/35042
http://secunia.com/advisories/35065
http://secunia.com/advisories/35536
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5265
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A5591
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6139
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A6831
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A9494
http://sunsolve.sun.com/search/document.do?assetkey=1-66-264308-1
https://www.redhat.com/archives/fedora-package-announce/2009-April/msg00683.html
http://www.debian.org/security/2009/dsa-1797
http://www.mandriva.com/security/advisories?name=MDVSA-2009:111
http://www.mandriva.com/security/advisories?name=MDVSA-2009:141
http://www.mozilla.org/security/announce/2009/mfsa2009-19.html
http://www.redhat.com/support/errata/RHSA-2009-0436.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?1022094