cbcvebase.
CVE-2026-6763
published 2026-04-21

CVE-2026-6763: Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

medium6.5CVSS 3.1
AVNACLPRNUINSUCLILAN
Mitigation bypass in the File Handling component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Affected

9 ranges
VendorProductVersion rangeFixed in
mozillafirefox< Firefox 150Firefox 150
mozillafirefox< 140.10.0140.10.0
mozillafirefox< 150.0150.0
mozillafirefox——
mozillafirefox_esr< Firefox ESR 140.10Firefox ESR 140.10
mozillathunderbird< Thunderbird 150Thunderbird 150
mozillathunderbird< Thunderbird 140.10Thunderbird 140.10
mozillathunderbird>= 140.0 < 140.10.0140.10.0
rhel10firefox-flatpak——