CVE-2025-8043

Name: CVE-2025-8043
Creator: NVD / NIST
Published: 2025-07-22T21:15:51.263+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.37%

Last modified Jun 17, 2026

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

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

0.37%

28.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-451

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: Jul 22, 2025
Last Modified: Jun 17, 2026
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.

Are you affected by CVE-2025-8043?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST