CVE-2025-14331CWE-346

CVE-2025-14331

Medium · published December 9, 2025

CVSS v3.1

6.5

EPSS

Percentile

7.9

In the wild

Unconfirmed

What it is

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.

The record

Technical detail

CVSS v3.1: 6.5 · MEDIUM
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
CVSS v4.0: Not supplied
EPSS: 0.00187 · 7.9th percentile
Weakness: CWE-346 · Origin Validation Error
Published: 2025-12-09T21:17Z

Affected products (5)

Product	Versions	Fixed in
mozilla/firefox	< 115.31.0	115.31.0
mozilla/firefox	< 146.0	146.0
mozilla/firefox	≥ 116.0, < 140.6.0	140.6.0
mozilla/thunderbird	< 140.6.0	140.6.0
mozilla/thunderbird	< 146.0	146.0

References (6)

https://bugzilla.mozilla.org/show_bug.cgi?id=2000218 · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-92/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-93/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-94/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-95/ · [email protected]https://www.mozilla.org/security/advisories/mfsa2025-96/ · [email protected]

EPSS history

Timeline

09 DEC 13:38Z
Same-origin policy bypass in the Request Handling component
cvelistv5