Vulnerability in Mozilla Firefox
CVE-2025-14327
Spoofing issue in the Downloads Panel component. This vulnerability was fixed in Firefox 146, Thunderbird 146, Firefox ESR 140.7, and Thunderbird 140.7.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.004 (29.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 29th percentile — 29.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: -0.000
Affected products
- Mozilla Firefox — versions 140.7, 146
- Mozilla Thunderbird — versions 140.7, 146
Weakness classification (CWE)
References
- bugzilla.mozilla.org/show_bug.cgi (Permissions Required, Issue Tracking)
- www.mozilla.org/security/advisories/mfsa2025-92/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-95/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2026-03/
- www.mozilla.org/security/advisories/mfsa2026-05/
Frequently asked questions
- What is CVE-2025-14327?
- CVE-2025-14327 is a high-severity vulnerability in Mozilla Firefox, classified under Authentication Bypass by Spoofing. CVSS score: 7.5/10. Published 2025-12-09.
- How severe is CVE-2025-14327?
- High severity. CVSS v3 base score is 7.5 out of 10.