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.

CVSS 3.1

6.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

EPSS

0.2% chance of exploitation in the next 30 days; higher than 8% of CVEs (scores of 2026-10-25)

CWE

CWE-346

Published

2025-12-09

Modified

2026-10-07

Record from

the NVD, synced 2026-10-19

Affected

• mozilla:firefox
• mozilla:thunderbird

References

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

Check your stackJSON