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CVE-2026-74956

CRITICAL CVSS: 9.1 Published: 2026-08-18 Modified: 2026-08-19

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.

Affected Platforms

Mozilla FirefoxMozilla Thunderbird

Weakness Type

CWE-843

References