CVE-2026-6761

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-6761
Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.

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=2017857 Permissions Required
https://www.mozilla.org/security/advisories/mfsa2026-30/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-32/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-33/ Vendor Advisory
https://www.mozilla.org/security/advisories/mfsa2026-34/ 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:*:*:*
History

22 Apr 2026, 14:56

Type Values Removed Values Added
CPE cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
First Time Mozilla
Mozilla firefox
Mozilla thunderbird
References () https://bugzilla.mozilla.org/show_bug.cgi?id=2017857 - () https://bugzilla.mozilla.org/show_bug.cgi?id=2017857 - Permissions Required
References () https://www.mozilla.org/security/advisories/mfsa2026-30/ - () https://www.mozilla.org/security/advisories/mfsa2026-30/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-32/ - () https://www.mozilla.org/security/advisories/mfsa2026-32/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-33/ - () https://www.mozilla.org/security/advisories/mfsa2026-33/ - Vendor Advisory
References () https://www.mozilla.org/security/advisories/mfsa2026-34/ - () https://www.mozilla.org/security/advisories/mfsa2026-34/ - Vendor Advisory

22 Apr 2026, 00:16

Type Values Removed Values Added
Summary (en) Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150 and Firefox ESR 140.10. (en) Privilege escalation in the Networking component. This vulnerability was fixed in Firefox 150, Firefox ESR 140.10, Thunderbird 150, and Thunderbird 140.10.
References
  • () https://www.mozilla.org/security/advisories/mfsa2026-33/ -
  • () https://www.mozilla.org/security/advisories/mfsa2026-34/ -

21 Apr 2026, 21:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : 6.5 		v2 : unknown
v3 : 8.8

21 Apr 2026, 18:16

Type Values Removed Values Added
CWE CWE-269
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 6.5

21 Apr 2026, 13:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-04-21 13:16

Updated : 2026-04-22 14:56

NVD link : CVE-2026-6761

Mitre link : CVE-2026-6761

CVE.ORG link : CVE-2026-6761

JSON object : View

Products Affected

mozilla

  • thunderbird
  • firefox
CWE
CWE-269

Improper Privilege Management