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9.8 Critical

CVE-2026-84129 Site isolation issue in the DOM: Navigation component

Description

Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and Thunderbird 153.2.

Affected products and versions

Product	Affected versions	Fixed in
Firefox 155	earliest → < 155	155
Firefox 153.2	earliest → < 153.2	153.2
Thunderbird 155	earliest → < 155	155
Thunderbird 153.2	earliest → < 153.2	153.2

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 1, 2026
Last modified September 2, 2026

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