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9.8 Critical

CVE-2026-109780 Mitigation bypass in the DOM: Core & HTML component

Description

Mitigation bypass in the DOM: Core & HTML component. This vulnerability was fixed in Firefox 158 and Thunderbird 158.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 158	earliest → < 158	158
Thunderbird 158	earliest → < 158	158

References

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

Timeline

Published October 13, 2026
Last modified October 26, 2026

The 2221 CVEs of Firefox →

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