Mozilla Firefox 4.x through 5, Thunderbird before 6, SeaMonkey 2.x before 2.3, and possibly other products, when the Direct2D (aka D2D) API is used on Windows, allows remote attackers to bypass the Same Origin Policy, and obtain sensitive image data from a different domain, by inserting this data into a canvas.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14497
https://bugzilla.mozilla.org/show_bug.cgi?id=655836
http://www.mozilla.org/security/announce/2011/mfsa2011-33.html
http://www.mozilla.org/security/announce/2011/mfsa2011-31.html
http://www.mozilla.org/security/announce/2011/mfsa2011-29.html
http://secunia.com/advisories/49055
http://lists.opensuse.org/opensuse-security-announce/2011-08/msg00023.html