CVE-2026-4692

CriticalCVSS 10.0/10Last modified Jul 15, 2026

Description

Sandbox escape in the Responsive Design Mode component. This vulnerability was fixed in Firefox 149, Firefox ESR 115.34, Firefox ESR 140.9, Thunderbird 149, and Thunderbird 140.9.

Metrics

CVSS 3.1 10.0/10CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-653

Affected software

No affected versions have been published.

Timeline

Published
Mar 24, 2026
Last modified
Jul 15, 2026
NVD status
Modified

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CVE-2026-4692: Critical severity, CVSS 10.0 | Vulnix