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OpenAdvisories
High · 8.8 CVE-2026-66842 EUVD-2026-70136GHSA-cgm7-wqwh-h7hh

BIG-IP and BIG-IQ Configuration utility vulnerability

Published Sep 2, 2026 · Updated Sep 3, 2026 · Assigned by f5

Description

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.

Affected products

VendorProductAffectedFixed
F5 BIG-IP 21.1.0 – < 21.1.0.1, 21.0.0 – < 21.0.0.3, 17.5.0 – < 17.5.1.8, 17.1.0 – < 17.1.3.4 21.1.0.1
F5 BIG-IQ 8.4.0 – < 8.4.2.1 8.4.2.1

Advisories 1

References