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9.1 Critical

CVE-2026-92079 Mitigation bypass in the Widget: Win32 component

Description

Mitigation bypass in the Widget: Win32 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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