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
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.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2026
- CVE-2026-84003Authentication bypass by capture-replay in Microsoft Authent…7.4
- CVE-2026-84004Processor optimization removal or modification of security-c…5.5
- CVE-2026-84005Processor optimization removal or modification of security-c…5.5
- CVE-2026-84007Out-of-bounds read in Remote Desktop Gateway Service allows …6.5
- CVE-2026-84008Inefficient algorithmic complexity in .NET allows an unautho…7.5
- CVE-2026-84009Time-of-check time-of-use (toctou) race condition in Windows…4.7
- CVE-2026-84010Exposed dangerous method or function in SQL Server allows an…7.5
- CVE-2026-84011Incorrect authorization in Windows SMB Client allows an auth…5.5
- CVE-2026-84012Double free in Remote Desktop Gateway Service allows an unau…8.1
- CVE-2026-84013Use after free in Windows Telephony Server allows an authori…7.8
- CVE-2026-84014Heap-based buffer overflow in Windows Device Association Ser…7
- CVE-2026-84015Heap-based buffer overflow in Remote Access Point-to-Point P…9.8
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