CVE-2026-74942

CVE-2026-74942

Privilege escalation in the Remote Settings Client component. This vulnerability was fixed in Firefox 154, Firefox ESR 115.39, Firefox ESR 140.14, Firefox ESR 153.1, Thunderbird 154, Thunderbird 140.14, and Thunderbird 153.1.

Vulnerability class: Privilege Escalation

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.

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-74942?
CVE-2026-74942 is a high-severity vulnerability, classified under Improper Privilege Management. CVSS score: 8.8/10. Published 2026-08-18.
How severe is CVE-2026-74942?
High severity. CVSS v3 base score is 8.8 out of 10.