Vulnerability in Mozilla Firefox
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.4th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: +0.000
Affected products
- Mozilla Firefox — versions 115.31, 140.6, 146
- Mozilla Thunderbird — versions 140.6, 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/mfsa2025-93/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-94/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-95/ (Vendor Advisory)
- www.mozilla.org/security/advisories/mfsa2025-96/ (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-14331?
- CVE-2025-14331 is a medium-severity vulnerability in Mozilla Firefox, classified under Origin Validation Error. CVSS score: 6.5/10. Published 2025-12-09.
- How severe is CVE-2025-14331?
- Medium severity. CVSS v3 base score is 6.5 out of 10.