CVE-2026-8961

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-8961
Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

6.5 /10

CVSS v3 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact NONE

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://bugzilla.mozilla.org/show_bug.cgi?id=1962625 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, 17:58

Type Values Removed Values Added
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:*:*:*:*:-:*:*:*
First Time Mozilla thunderbird
Mozilla
Mozilla firefox
References () https://bugzilla.mozilla.org/show_bug.cgi?id=1962625 - () https://bugzilla.mozilla.org/show_bug.cgi?id=1962625 - 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

20 May 2026, 17:16

Type Values Removed Values Added
CVSS v2 : unknown
v3 : unknown 		v2 : unknown
v3 : 6.5
CWE CWE-290

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) Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151 and Firefox ESR 140.11. (en) Spoofing issue in the Form Autofill component. This vulnerability was fixed in Firefox 151, Firefox ESR 140.11, Thunderbird 151, and Thunderbird 140.11.

19 May 2026, 14:16

Type Values Removed Values Added
New CVE
Information

Published : 2026-05-19 14:16

Updated : 2026-05-20 17:58

NVD link : CVE-2026-8961

Mitre link : CVE-2026-8961

CVE.ORG link : CVE-2026-8961

JSON object : View

Products Affected

mozilla

  • firefox
  • thunderbird
CWE
CWE-290

Authentication Bypass by Spoofing