CVE-2026-74979
CVE-2026-74979
Mitigation bypass in the Add-ons Manager component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-74979?
- CVE-2026-74979 is a critical-severity vulnerability, classified under Improper Access Control. CVSS score: 9.8/10. Published 2026-08-18.
- How severe is CVE-2026-74979?
- Critical severity. CVSS v3 base score is 9.8 out of 10.