CVE-2026-23759 Perle IOLAN STS/SCS Authenticated Command Injection via 'shell ps'
Authenticated attackers can inject commands via the 'ps' command in Perle IOLAN terminal servers to execute arbitrary code with root privileges.
- 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-2026-23759?
CVE-2026-23759 is a high-severity command injection vulnerability in Perle Systems IOLAN SCS, published on 17 Mar 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
Perle IOLAN STS/SCS terminal server models with firmware versions prior to 6.0 allow authenticated OS command injection via the restricted shell accessed over Telnet or SSH. The shell 'ps' command does not perform proper argument sanitization and passes user-supplied parameters into an 'sh -c' invocation running as root. An authenticated attacker who can log in to the device can inject shell metacharacters after the 'ps' subcommand to execute arbitrary OS commands with root privileges, leading to full compromise of the underlying operating system.
Weakness: CWE-78
Which versions are affected by CVE-2026-23759?
How do I fix CVE-2026-23759?
No fix has been published for CVE-2026-23759 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-2026-23759 being exploited?
There is no known exploitation of CVE-2026-23759 in the wild and no public exploit code.
Sources
Also known as GHSA-rcw4-cmhr-ggx7.