CVE-2012-4196: Mozilla Firefox before 16.0.2, Firefox ESR 10.x before 10.0.10, Thunderbird before 16.0.2, Thunderbird ESR...

Security readout for executives and security teams

This is an old Mozilla client-side security flaw. A malicious remote page could bypass browser same-origin protections and read location-related information in affected Firefox, Thunderbird, and SeaMonkey versions. The main business concern is legacy desktops, servers with GUI browsers, or email clients that were never upgraded. Exposure is likely limited to environments still running the listed 2012-era Mozilla products or embedded/managed systems frozen on those versions. Modern supported browsers and mail clients are unlikely to be affected, but legacy images and offline workstations should be checked. Prioritize as a legacy hygiene issue unless those old Mozilla clients are still in active use. If found on internet-browsing or email-reading systems, remediate promptly because the flaw weakens a core browser isolation boundary. Mitigation focus: Upgrade Firefox to 16.0.2 or later where present.; Upgrade Firefox ESR 10.x to 10.0.10 or later.; Upgrade Thunderbird to 16.0.2 or later where present..

Prepared

Jun 24, 2026, 19:46 UTC (UTC+00:00)

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