CVE-2025-14331

MEDIUM

Published Dec 9, 2025 Modified Apr 13, 2026 CWE-346

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.

CVSS v3.1 Score

6.5

MEDIUM

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

Weakness Type (CWE)

CWE-346 CWE-346

Affected Products

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

Advisories & Patches

https://www.mozilla.org/security/advisories/mfsa2025-92/ https://www.mozilla.org/security/advisories/mfsa2025-93/ https://www.mozilla.org/security/advisories/mfsa2025-94/ https://www.mozilla.org/security/advisories/mfsa2025-95/ https://www.mozilla.org/security/advisories/mfsa2025-96/

Other References

https://bugzilla.mozilla.org/show_bug.cgi?id=2000218

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2025-14331? +

CVE-2025-14331 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-14331? +

CVE-2025-14331 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-2025-14331? +

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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Quick Facts

CVSS Score: 6.5
Severity: MEDIUM
Published: Dec 9, 2025

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