CVE-2026-100804

CriticalCVSS 9.6/10Last modified Oct 19, 2026

Description

Sandbox escape due to use-after-free in the Preferences: Backend component. This vulnerability was fixed in Thunderbird 157 and Firefox 157.

Metrics

CVSS 3.1 9.6/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Weakness enumeration

CWE-416

Affected software

No affected versions have been published.

Timeline

Published
Sep 29, 2026
Last modified
Oct 19, 2026
NVD status
Analyzed

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