CVE-2015-7188: Mozilla Firefox before 42.0 and Firefox ESR 38.x before 38.4 allow remote attackers to bypass the Same Orig...

Security readout for executives and security teams

This is an old Firefox browser flaw where a specially formed IP address string could confuse same-origin checks. If an employee used an affected Firefox version to visit malicious content, the attacker could bypass browser isolation and perform cross-site scripting against IP-address origins. Exposure is mainly legacy endpoints, kiosks, embedded workstations, or unmanaged systems still running Firefox before 42.0 or ESR 38.x before 38.4. Treat as a legacy hygiene issue unless old Firefox remains in use. Prioritize remediation where browsers access internal IP-based services or shared operational systems. Mitigation focus: Upgrade Firefox to 42.0 or later, or Firefox ESR to 38.4 or later.; Apply relevant Linux distribution browser updates from Debian, Ubuntu, Gentoo, SUSE, or Red Hat advisories.; Remove unsupported Firefox builds from managed endpoints and golden images..

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.