CVE-2026-23759

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.