CVE-2026-8970

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-8970
Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

8.8 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=2032174 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-46/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-48/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-50/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-51/ Vendor Advisory
Configurations

Configuration 1 (hide)

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

20 May 2026, 17:34

Type Values Removed Values Added
First Time Mozilla thunderbird
Mozilla
Mozilla firefox
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2032174 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2032174 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-46/ - () https://www.mozilla.org/security/advisories/mfsa2026-46/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-48/ - () https://www.mozilla.org/security/advisories/mfsa2026-48/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-50/ - () https://www.mozilla.org/security/advisories/mfsa2026-50/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-51/ - () https://www.mozilla.org/security/advisories/mfsa2026-51/ - Vendor Advisory
CPE cpe:2.3:a:mozilla:thunderbird:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*

20 May 2026, 17:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : 7.3 		v2 : unknown
v3 : 8.8

19 May 2026, 18:16

Type Values Removed Values Added
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-50/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-51/ -
Summary (en) Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11. (en) Privilege escalation in the Security component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

19 May 2026, 15:16

Type Values Removed Values Added
CWE CWE-269
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 7.3

19 May 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-19 14:16

Updated : 2026-05-20 17:34

NVD link : CVE-2026-8970

Mitre link : CVE-2026-8970

CVE.ORG link : CVE-2026-8970

JSON object : View

Products Affected

mozilla

  • firefox
  • thunderbird
CWE
CWE-269

Improper Privilege Management