CVE-2026-39459 iControl REST and tmsh vulnerability
A highly privileged authenticated attacker can execute arbitrary commands on F5 BIG-IP devices via iControl REST and tmsh.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-39459?
CVE-2026-39459 is a high-severity command injection vulnerability in F5 Big-Ip Access Policy Manager, published on 13 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A vulnerability exists in iControl REST and the TMOS Shell (tmsh) where a highly privileged, authenticated attacker with at least the Manager role can create configuration objects that allow running arbitrary commands.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weakness: CWE-272
Which versions are affected by CVE-2026-39459?
It affects 21 products.
Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager and 15 more.
How do I fix CVE-2026-39459?
No fix has been published for CVE-2026-39459 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-39459 being exploited?
There is no known exploitation of CVE-2026-39459 in the wild and no public exploit code.
Other vulnerabilities in F5 Big-Ip Access Policy Manager
- CVE-2023-46747 F5 BIG-IP Configuration Utility Authentication Bypass
- CVE-2022-1388 F5 BIG-IP Missing Authentication
- CVE-2021-22986 F5 BIG-IP and BIG-IQ Centralized Management iControl REST Remote Code Execution
- CVE-2021-22991 F5 BIG-IP Traffic Management Microkernel Buffer Overflow
- CVE-2020-5902 F5 BIG-IP Traffic Management User Interface (TMUI) Remote Code Execution
Sources
Also known as GHSA-pwjh-hfqc-xgc7.