CVE-2025-10531
5.4MEDIUMMitigation bypass in the Web Compatibility: Tooling component. This vulnerability affects Firefox < 143 and Thunderbird < 143.
Published: 9/16/2025Updated: 10/30/2025
Description
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability affects Firefox < 143 and Thunderbird < 143.
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Affected Products
mozillafirefox
mozillathunderbird
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1978453Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-73/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-77/Vendor Advisory