🔐 CVE Alert

CVE-2025-10531

MEDIUM 5.4

Mitigation bypass in the Web Compatibility: Tooling component

CVSS Score
5.4
EPSS Score
0.0%
EPSS Percentile
0th

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

Vendor mozilla
Product firefox
Ecosystems
Industries
Technology
Published Sep 16, 2025
Last Updated Apr 13, 2026
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Affected Versions

Mozilla / Firefox
All versions affected
Mozilla / Thunderbird
All versions affected

References

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

Credits

Nikolaos Mourousias