CVE-2025-8043

CRITICAL

Published Jul 22, 2025 Modified Apr 13, 2026 CWE-451

Description

Focus incorrectly truncated URLs towards the beginning instead of around the origin. This vulnerability was fixed in Firefox 141.

CVSS v3.1 Score

9.8

CRITICAL

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

Weakness Type (CWE)

CWE-451 CWE-451

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 141.0
mozilla	thunderbird	< 141.0

References

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-56/

Exploits

https://bugzilla.mozilla.org/show_bug.cgi?id=1970209

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-8043? +

CVE-2025-8043 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-8043? +

CVE-2025-8043 affects products from mozilla, specifically: firefox, thunderbird. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-8043? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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