CVE-2026-66842 BIG-IP and BIG-IQ Configuration utility vulnerability
Authenticated attackers can escalate privileges by creating administrative accounts via the TMUI interface on F5 BIG-IP systems.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-66842?
CVE-2026-66842 is a high-severity vulnerability in F5 BIG-IP, published on 2 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-918
Which versions are affected by CVE-2026-66842?
How do I fix CVE-2026-66842?
No fix has been published for CVE-2026-66842 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-66842 being exploited?
There is no known exploitation of CVE-2026-66842 in the wild and no public exploit code.
Sources
Also known as GHSA-cgm7-wqwh-h7hh.