CVE-2014-1487: The Web workers implementation in Mozilla Firefox before 27.0, Firefox ESR 24.x before 24.3, Thunderbird be...

Security readout for executives and security teams

This is an old Mozilla client-side flaw where malicious web content could bypass browser origin boundaries and expose sensitive authentication information through error messages. It affected Firefox, Firefox ESR, Thunderbird, and SeaMonkey versions before the fixed releases named in the CVE. Exposure is most likely on legacy endpoints, VDI images, kiosk systems, or old Linux distributions still running vulnerable Mozilla packages. Modern supported versions should not be affected based on the fixed-version boundaries in the CVE. Treat this as a legacy-client exposure issue. It is not marked as actively exploited in the provided sources, but affected clients could leak authentication information if users encounter malicious content. Prioritize remediation where old browsers or mail clients remain in production. Mitigation focus: Upgrade Firefox to 27.0 or later where applicable.; Upgrade Firefox ESR 24.x to 24.3 or later.; Upgrade Thunderbird to 24.3 or later..

Prepared

Jun 14, 2026, 14:50 UTC (UTC+00:00)

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