Vulnerabilities
Vulnerable Software

Vulnerability Details 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 Thunderbird 153.2.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 8.1%
CVSS Severity
CVSS v3 Score 9.8
Products affected by CVE-2026-84140


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