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.
lists.opensuse.org/opensuse-security-announce/2011-08/msg00023.html
secunia.com/advisories/49055
www.mozilla.org/security/announce/2011/mfsa2011-29.html
www.mozilla.org/security/announce/2011/mfsa2011-31.html
www.mozilla.org/security/announce/2011/mfsa2011-33.html
bugzilla.mozilla.org/show_bug.cgi?id=655836
oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A14497