CVE-2026-4700 Mitigation bypass in the Networking: HTTP component

Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9...

CVE-2026-4700

CVE-2026-4700 affects Firefox and Thunderbird; mitigation bypass in the Networking: HTTP component was fixed in Firefox 149 / ESR 140.9 and Thunderbird 149 / 140.9. The CVSS 3.1 score is 9.8 (CRITICAL) with NETWORK attack vector and no user interaction. Remediation per provided docs: upgrade to F...

CVE-2026-4700 Mitigation bypass in the Networking: HTTP component

Mitigation bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9...