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9.1 Critical

CVE-2026-92075 Mitigation bypass in the Networking component

Description

Mitigation bypass in the Networking component. This vulnerability was fixed in Firefox 156, Firefox ESR 153.3, Thunderbird 156, and Thunderbird 153.3.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 156	earliest → < 156	156
Firefox 153.3	earliest → < 153.3	153.3
Thunderbird 156	earliest → < 156	156
Thunderbird 153.3	earliest → < 153.3	153.3

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 September 15, 2026
Last modified September 22, 2026

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