CVE-2026-8401
CRITICALCVSS 9.8/10EPSS 0.31%
Last modified
CVE-2026-8401 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.. EPSS estimates a 0.31% chance of exploitation in the next 30 days.
Description
Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 150.0.3 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2038679Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2026-45/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2026-8401?
Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.
How severe is CVE-2026-8401?
CVE-2026-8401 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.31% probability of exploitation in the next 30 days.
How do I fix CVE-2026-8401?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
Are you affected by CVE-2026-8401?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST