Use-after-free in the DOM: UI Events & Focus Handling component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://www.mozilla.org/security/advisories/mfsa2026-100/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-101/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-103/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-97/ Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.8 · mozillaNVD modified 2026-10-13 15:27
Affected (CPE criteria) 2
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
References 5
- https://bugzilla.mozilla.org/show_bug.cgi?id=2067172 Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-100/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-101/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-103/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-97/ Vendor Advisory