CVE-2026-84140
Site isolation issue in the DOM: Navigation component. This vulnerability was fixed in Firefox 155, Firefox ESR 153.2, Thunderbird 155, and
CVSS
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KEV
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Exploit Today
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0-100
Published: Sep 1, 2026 · Last modified: Sep 1, 2026
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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.
- bugzilla.mozilla.orghttps://bugzilla.mozilla.org/show_bug.cgi?id=2063780
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-82/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-85/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-86/
- www.mozilla.orghttps://www.mozilla.org/security/advisories/mfsa2026-88/
No related CVEs by CWE or product.