VULNERABILITY INTELLIGENCE

CVE-2026-74956

CVSS score9.1 CRITICAL

EPSS probability0.50%

CISA KEVNot currently listed

Published2026-08-18

Last modified2026-08-19

Description

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.