CVE-2010-1207
Mozilla Firefox before 3.6.7 and Thunderbird before 3.1.1 do not properly implement read restrictions for CANVAS elements, which allows remote attackers to obtain sensitive cross-origin information via vectors involving reference retention and node deletion.
Date published : 2010-07-30
http://www.mozilla.org/security/announce/2010/mfsa2010-43.html