Vulnerability Details CVE-2026-100820
Privilege escalation in the Address Bar component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, and Firefox ESR 140.17.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 14.7%
CVSS Severity
CVSS v3 Score 8.8
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2071645
- https://www.mozilla.org/security/advisories/mfsa2026-100/
- https://www.mozilla.org/security/advisories/mfsa2026-101/
- https://www.mozilla.org/security/advisories/mfsa2026-102/
- https://www.mozilla.org/security/advisories/mfsa2026-103/
- https://www.mozilla.org/security/advisories/mfsa2026-97/
- https://www.mozilla.org/security/advisories/mfsa2026-99/