CVE-2026-6771

CriticalCVSS 9.8/10Last modified Jun 17, 2026

Description

Mitigation bypass in the DOM: Security component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

Metrics

CVSS 3.1 9.8/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness enumeration

CWE-288

Affected software

No affected versions have been published.

Timeline

Published
Apr 21, 2026
Last modified
Jun 17, 2026
NVD status
Analyzed

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CVE-2026-6771: Critical severity, CVSS 9.8 | Vulnix