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9.1 Critical

CVE-2026-8948 Same-origin policy bypass in the DOM: Networking component

Description

Same-origin policy bypass in the DOM: Networking component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 151	earliest → < 151	151
Thunderbird 151	earliest → < 151	151
Red Hat Enterprise Linux 10	Versions not published
Red Hat Enterprise Linux 6	Versions not published
Red Hat Enterprise Linux 7	Versions not published
Red Hat Enterprise Linux 8	Versions not published
Red Hat Enterprise Linux 9	Versions not published

References

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

Timeline

Published May 19, 2026
Last modified July 15, 2026

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