This indicates an attack attempt to exploit an Remote Command Injection vulnerability in Cayin CMS.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application. An authenticated remote attacker may be able to exploit this to execute arbitrary commands within the context of the application.
Cayin CMS version 11.0 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
We are currently unaware of any vendor supplied patches available for this issue.