CVE-2025-14331

Name: CVE-2025-14331
Creator: NVD / NIST
Published: 2025-12-09T16:17:40.773+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 0.16%

Last modified Jun 17, 2026

CVE-2025-14331 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

0.16%

5.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mozilla	Firefox	< 115.31.0
Mozilla	Firefox	< 146.0
Mozilla	Firefox	>= 116.0, < 140.6.0
Mozilla	Thunderbird	< 140.6.0
Mozilla	Thunderbird	< 146.0

References

https://bugzilla.mozilla.org/show_bug.cgi?id=2000218Issue Tracking, Permissions Required
https://www.mozilla.org/security/advisories/mfsa2025-92/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-93/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-94/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-95/Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-96/Vendor Advisory

Timeline

Published: Dec 9, 2025
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2025-14331?

Same-origin policy bypass in the Request Handling component. This vulnerability was fixed in Firefox 146, Firefox ESR 115.31, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.

How severe is CVE-2025-14331?

CVE-2025-14331 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.

How do I fix CVE-2025-14331?

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-2025-14331?

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

Scan your code now

Source: NVD / NIST