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Mitigation-Bypass

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critical advisory

Firefox and Thunderbird Mitigation Bypass Vulnerability (CVE-2026-4700)

CVE-2026-4700 is a critical vulnerability in the Networking: HTTP component of Firefox, Firefox ESR, and Thunderbird, allowing a mitigation bypass in versions prior to Firefox 149, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

cve-2026-4700 firefox thunderbird mitigation-bypass
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