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9.6 Critical

CVE-2026-100829 Mitigation bypass in the DOM: Security component

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 153.4, and Firefox 157.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 157	earliest → < 157	157
Firefox 153.4	earliest → < 153.4	153.4
Thunderbird 157	earliest → < 157	157
Thunderbird 153.4	earliest → < 153.4	153.4

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 29, 2026
Last modified October 1, 2026

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