CVE-2026-0881

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-0881
Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

10.0 /10

CVSS v3 : CRITICAL

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 6.0

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2005845 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-01/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-04/ Vendor Advisory
Configurations

Configuration 1 (hide)

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

13 Apr 2026, 15:17

Type Values Removed Values Added
Summary
  • (es) Escape de sandbox en el componente del Sistema de Mensajería. Esta vulnerabilidad afecta a Firefox < 147 y Thunderbird < 147.
Summary (en) Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147 and Thunderbird < 147. (en) Sandbox escape in the Messaging System component. This vulnerability was fixed in Firefox 147 and Thunderbird 147.

22 Jan 2026, 18:50

Type Values Removed Values Added
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2005845 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2005845 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-01/ - () https://www.mozilla.org/security/advisories/mfsa2026-01/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-04/ - () https://www.mozilla.org/security/advisories/mfsa2026-04/ - Vendor Advisory
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
First Time Mozilla
Mozilla firefox
Mozilla thunderbird

15 Jan 2026, 10:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-04/ -
Summary (en) Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147. (en) Sandbox escape in the Messaging System component. This vulnerability affects Firefox < 147 and Thunderbird < 147.

13 Jan 2026, 19:16

Type Values Removed Values Added
CWE CWE-284
CWE-693
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 10.0

13 Jan 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-01-13 14:16

Updated : 2026-04-13 15:17

NVD link : CVE-2026-0881

Mitre link : CVE-2026-0881

CVE.ORG link : CVE-2026-0881

JSON object : View

Products Affected

mozilla

  • thunderbird
  • firefox
CWE
CWE-284

Improper Access Control

CWE-693

Protection Mechanism Failure