CVE-2025-10531

EUVD-2025-29555
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
mozillaCNA
5.4 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Base Score
CVSS 3.x
EPSS Score
Percentile: 17.95%
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
mozillafirefox
𝑥
< 143.0
CNA
mozillathunderbird
𝑥
< 143.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
firefox
sid
156.0-1
fixed
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
firefox
jammy
not-affected
noble
not-affected
plucky
not-affected
questing
not-affected
thunderbird
jammy
not-affected
noble
not-affected
plucky
not-affected
questing
not-affected
Common Weakness Enumeration
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/