What is CVE-2026-8945?

CVE-2026-8945 is a high-severity vulnerability in Mozilla Firefox, classified under Protection Mechanism Failure. CVSS score: 7.5/10. Published 2026-05-19.

How severe is CVE-2026-8945?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Mozilla Firefox

CVE-2026-8945

Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.

EPSS: 0.001 (18.7th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products

Mozilla Firefox — versions 151
Mozilla Firefox_focus

Weakness classification (CWE)

CWE-693 — Protection Mechanism Failure

References

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

Frequently asked questions

What is CVE-2026-8945?: CVE-2026-8945 is a high-severity vulnerability in Mozilla Firefox, classified under Protection Mechanism Failure. CVSS score: 7.5/10. Published 2026-05-19.
How severe is CVE-2026-8945?: High severity. CVSS v3 base score is 7.5 out of 10.