Use-after-free in the Widget component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Fix
Patch, vendor advisory and mitigation references on NVD 7
- 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/mfsa2026-102/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-103/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-97/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-98/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-99/ 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 21:03
Affected (CPE criteria) 2
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
References 8
- https://bugzilla.mozilla.org/show_bug.cgi?id=2049352 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/mfsa2026-102/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-103/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-97/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-98/ Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2026-99/ Vendor Advisory