CVE-2026-8401

—

CVSS 3.1

9.8 critical

EPSS

<1%p24

Published

May 12, 2026 (May 12, 2026)

Modified

Jul 15, 2026

Description

Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, Firefox ESR 140.11, and Thunderbird 140.11.

Vendors: mozilla
Products: firefox
Weakness: CWE-693, CWE-653
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (0.3%)

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