Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-100819

Sandbox escape due to incorrect boundary conditions in the XPCOM component. This vulnerability was fixed in Firefox ESR 153.4, Thunderbird 157, Thunderbird 140.17, Thunderbird 153.4, Firefox 157, Firefox ESR 115.42, and Firefox ESR 140.17.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.003
EPSS Ranking 18.2%
CVSS Severity
CVSS v3 Score 9.6
Products affected by CVE-2026-100819


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