CRITICALCVSS 9.8

CVE-2026-84140

CVE-2026-84140 updated by NVD

Modified: 2026-09-05
Sources: nvd

Summary

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.

References

https://nvd.nist.gov/vuln/detail/CVE-2026-84140

Includes data from the National Vulnerability Database (NIST). NVD data is in the public domain; this page is not endorsed by NIST.

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