CVE-2025-10531

Mitigation bypass in the Web Compatibility: Tooling component

State: Published
Severity: 5.4 Medium
Published: Sep 16, 2025
Updated: Apr 13, 2026
Reserved: Sep 16, 2025

Description

Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.

Scores

CVSS	Score	Vector	Source
3.1	5.4 Medium	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N	CISA-ADP

Weaknesses

CWE-288 Authentication Bypass Using an Alternate Path or Channel

Affected Products

Product	Versions
FirefoxMozilla	143 and laterNot affected
ThunderbirdMozilla	143 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1978453
https://www.mozilla.org/security/advisories/mfsa2025-73/
https://www.mozilla.org/security/advisories/mfsa2025-77/

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