Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-16387

Site isolation issue in the Networking component. This vulnerability was fixed in Firefox 153, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 10.6%
CVSS Severity
CVSS v3 Score 9.8
Products affected by CVE-2026-16387


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