Vulnerability in Mozilla Firefox
CVE-2026-4722
Privilege escalation in the IPC component. This vulnerability was fixed in Firefox 149 and Thunderbird 149.
EPSS: 0.003 (23.7th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.
Affected products
- Mozilla Firefox — versions 149
- Mozilla Thunderbird — versions 149
References
- security@mozilla.org (Permissions Required)
- security@mozilla.org (Vendor Advisory)
- security@mozilla.org
Frequently asked questions
- What is CVE-2026-4722?
- CVE-2026-4722 is a high-severity vulnerability in Mozilla Firefox. CVSS score: 8.8/10. Published 2026-03-24.
- How severe is CVE-2026-4722?
- High severity. CVSS v3 base score is 8.8 out of 10.