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9.3 Critical

CVE-2026-8950 Same-origin policy bypass in the Networking: HTTP component

Description

Same-origin policy bypass in the Networking: HTTP component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 151	earliest → < 151	151
Firefox 140.11	earliest → < 140.11	140.11
Thunderbird 151	earliest → < 151	151
Thunderbird 140.11	earliest → < 140.11	140.11

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

Timeline

Published May 19, 2026
Last modified May 19, 2026

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