CVE-2010-1207: Mozilla Firefox

Medium severity, CVSS 4.3. EPSS: 1.4% chance of exploitation in the next 30 days.

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.

Affected products

• Mozilla Firefox: up to and including 3.6.6; version 3.6 only; version 3.6.2 only; version 3.6.3 only; version 3.6.4 only
• Mozilla Thunderbird: up to and including 3.1

Published 2010-07-30. Last modified 2026-06-16.