CVE-2025-14331

MEDIUM 6.5

Same-origin policy bypass in the Request Handling component

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Dec 9, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

Mozilla / Thunderbird

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Igor Morgenstern