Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-74956

Same-origin policy bypass in the DOM: Service Workers component. This vulnerability was fixed in Firefox 154, Firefox ESR 153.1, Thunderbird 154, and Thunderbird 153.1.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 40.2%
CVSS Severity
CVSS v3 Score 9.1
Products affected by CVE-2026-74956


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