RCE in Mozilla Firefox

CVE-2026-8094

Other issue in the WebRTC component. This vulnerability was fixed in Firefox ESR 140.10.2 and Thunderbird 140.10.2.

Vulnerability class: RCE (Remote Code Execution)

EPSS: 0.000 (5.7th percentile) — read the EPSS interpretation.

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.

Affected products

Mozilla Firefox — versions 140.10.2
Mozilla Thunderbird — versions 140.10.2

Weakness classification (CWE)

CWE-94 — Code Injection

References

security@mozilla.org (Permissions Required)
security@mozilla.org (Vendor Advisory)
security@mozilla.org (Vendor Advisory)

Frequently asked questions

What is CVE-2026-8094?: CVE-2026-8094 is a critical-severity vulnerability in Mozilla Firefox, classified under Code Injection. CVSS score: 9.8/10. Published 2026-05-07.
How severe is CVE-2026-8094?: Critical severity. CVSS v3 base score is 9.8 out of 10.