VULNERABILITY INTELLIGENCE

CVE-2026-8401

CVSS score9.8 CRITICAL
EPSS probability0.31%
CISA KEVNot currently listed
Published2026-05-12
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

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.

Weakness classification

  • CWE-653: Improper Isolation or Compartmentalization
  • CWE-693: Protection Mechanism Failure

Primary references