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Vulnerability record · CVE-2025-14327 · published 9 December 2025

CVE-2025-14327: Mozilla firefox authentication bypass by spoofing vulnerability

Mozilla · Firefox

Spoofing issue in the Downloads Panel component. This vulnerability was fixed in Firefox 146, Thunderbird 146, Firefox ESR 140.7, and Thunderbird 140.7.

7.5 CVSS 3.1 High EPSS 0.38% · top 70.8% CWE-290 · Authentication bypass by spoofing
7.5CVSS 3.1 base score
0.38%EPSS exploitation probability, 30 days
NoNot in CISA KEV
2Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

Description

Spoofing issue in the Downloads Panel component. This vulnerability was fixed in Firefox 146, Thunderbird 146, Firefox ESR 140.7, and Thunderbird 140.7.

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

Affected products

2 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.mozilla.org/show_bug.cgi?id=1970743 Issue TrackingPermissions Required
https://www.mozilla.org/security/advisories/mfsa2025-92/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2025-95/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-03/
https://www.mozilla.org/security/advisories/mfsa2026-05/

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Same products first, then exploited flaws of the same weakness class.

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Source: NIST National Vulnerability Database (record CVE-2025-14327), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.