This indicates an attack attempt against a Command Injection vulnerability in Total.js CMS.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application while handling maliciously crafted upload. An authenticated remote attacker can exploit this to execute arbitrary code within context of the affected application via a crafted request.
Total.js CMS 12.0.0
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch of or update for this issue.