Mozilla Firefox before 3.6.20, SeaMonkey 2.x, Thunderbird 3.x before 3.1.12, and possibly other products does not properly handle the dropping of a tab element, which allows remote attackers to execute arbitrary JavaScript code with chrome privileges by establishing a content area and registering for drop events.
Exploitability
AV:NAC:LAu:NImpact
C:CI:CA:C10/AV:N/AC:L/Au:N/C:C/I:C/A:C