CVE-2026-12315criticalCWE-693

CVE-2026-12315: critical vulnerability in Mozilla Firefox

Mitigation bypass in the DOM: Security component

Published

28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.1epss 0.3%
exploitation probability
0.3%top 85% of all CVEs
observed exploitation
nono source reports it
Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Affected products
Mozilla · FirefoxMozilla · Thunderbird
Related CVEs — Mozilla Firefox

In the same product, most dangerous first.

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References
https://bugzilla.mozilla.org/show_bug.cgi?id=2042058https://www.mozilla.org/security/advisories/mfsa2026-57/https://www.mozilla.org/security/advisories/mfsa2026-58/https://www.mozilla.org/security/advisories/mfsa2026-60/https://www.mozilla.org/security/advisories/mfsa2026-61/