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6.5 Medium

CVE-2025-14331 Same-origin policy bypass in the Request Handling component

Description

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.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 146	earliest → < 146	146
Firefox 140.6	earliest → < 140.6	140.6
Firefox 115.31	earliest → < 115.31	115.31
Firefox ESR 140.6	earliest → < 140.6	140.6
Thunderbird 146	earliest → < 146	146
Thunderbird 140.6	earliest → < 140.6	140.6

References

bugzilla.mozilla.org bugzilla.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org
www.mozilla.org www.mozilla.org

Timeline

Published December 9, 2025
Last modified April 13, 2026

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