CVE-2026-8401

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-8401
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.

9.8 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2038679 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-45/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-47/
https://www.mozilla.org/security/advisories/mfsa2026-48/
https://www.mozilla.org/security/advisories/mfsa2026-51/
Configurations

Configuration 1 (hide)

cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
History

19 May 2026, 18:16

Type Values Removed Values Added
Summary (en) Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11. (en) 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.
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-51/ -

19 May 2026, 14:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-47/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-48/ -
Summary (en) Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3. (en) Sandbox escape in the Profile Backup component. This vulnerability was fixed in Firefox 150.0.3, Firefox ESR 115.36, and Firefox ESR 140.11.

15 May 2026, 20:05

Type Values Removed Values Added
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2038679 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2038679 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-45/ - () https://www.mozilla.org/security/advisories/mfsa2026-45/ - Vendor Advisory
First Time Mozilla
Mozilla firefox

14 May 2026, 20:17

Type Values Removed Values Added
CWE CWE-693
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 9.8

12 May 2026, 15:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-12 15:16

Updated : 2026-05-19 18:16

NVD link : CVE-2026-8401

Mitre link : CVE-2026-8401

CVE.ORG link : CVE-2026-8401

JSON object : View

Products Affected

mozilla

  • firefox
CWE
CWE-693

Protection Mechanism Failure