CVE-2012-3985: Mozilla Firefox before 16.0, Thunderbird before 16.0, and SeaMonkey before 2.13 do not properly implement t...

Security readout for executives and security teams

This flaw affected old Mozilla client software. A malicious site could bypass part of the browser same-origin boundary after document.domain was changed, enabling cross-site scripting against content that should have stayed isolated. Exposure is most likely on legacy endpoints or images still running affected Mozilla versions. Current systems using supported, updated releases should not be exposed based on the version ranges in the sources. Treat this as a legacy exposure cleanup item unless affected versions are found in production. Prioritize remediation where obsolete browsers or mail clients handle untrusted web or HTML content. Mitigation focus: Upgrade Firefox to 16.0 or later where still in use.; Upgrade Thunderbird to 16.0 or later where still in use.; Upgrade SeaMonkey to 2.13 or later where still in use..

Prepared

Jun 27, 2026, 16:25 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.