CVE-2026-66842 HIGH

CVE-2026-66842: BIG-IP and BIG-IQ Configuration utility vulnerability

Vendor F5
Product BIG-IP
Weakness CWE-918 · SSRF
Published September 2, 2026
Last update September 3, 2026

CVSS base score

8.8/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity High

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

What the vulnerability does

01Description

BIG-IP has a vulnerability where an authenticated user of any role may be able to create administrative user accounts through an undisclosed request to Traffic Management User Interface (TMUI). Impact: This vulnerability may allow an authenticated attacker with network access to the BIG-IP management interface to escalate privileges by creating administrative accounts on the BIG-IP system. There is no data plane exposure; this is a control plane issue only. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Key dates

02Disclosure timeline

September 2, 2026 CVE published
September 3, 2026 Record updated

Related vulnerabilities

04Related CVE