CVE-2026-84129 is a vulnerability in Mozilla Firefox
Published on September 1, 2026
Site isolation issue in the DOM: Navigation component
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155 and Firefox ESR 153.2.
Products Associated with CVE-2026-84129
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Affected Versions
Mozilla Firefox:- Version 153.2, <= 153.* is unaffected.
- Version 155, <= * is unaffected.