CVE-2025-8043
CRITICALCVSS 9.8/10EPSS 0.37%
Last modified
CVE-2025-8043 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.. EPSS estimates a 0.37% chance of exploitation in the next 30 days.
Description
Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 141.0 |
| Mozilla | Thunderbird | < 141.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1970209Exploit, Issue Tracking
- https://www.mozilla.org/security/advisories/mfsa2025-56/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-8043?
Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.
How severe is CVE-2025-8043?
CVE-2025-8043 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.
How do I fix CVE-2025-8043?
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.
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Are you affected by CVE-2025-8043?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST