CVE-2015-7193: Mozilla Firefox before 42.0 and Firefox ESR 38.x before 38.4 improperly follow the CORS cross-origin reques...

Security readout for executives and security teams

CVE-2015-7193 is a same-origin policy bypass in older Mozilla Firefox versions. A malicious website could cause an affected browser to mishandle certain cross-origin POST requests, potentially exposing data that browser protections should isolate. The bundle identifies Firefox before 42.0 and Firefox ESR 38.x before 38.4 as affected. Exposure is most likely on legacy endpoints, kiosks, VDI images, or older Linux distributions still running Firefox before 42.0 or Firefox ESR 38.x before 38.4. Modern managed browsers are unlikely to be affected if regularly updated. Treat this as a legacy exposure cleanup item unless old Firefox versions are still present in production. If affected browsers remain on user endpoints, prioritize remediation because browser same-origin protections are a core control against cross-site data exposure. Mitigation focus: Upgrade Firefox to 42.0 or later where applicable.; Upgrade Firefox ESR to 38.4 or later where applicable.; Apply relevant Debian, Ubuntu, Red Hat, SUSE, or Gentoo security updates..

Prepared

Jun 13, 2026, 21:45 UTC (UTC+00:00)

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