This indicates an attack attempt against a Remote Code Injection vulnerability in Accellion File Transfer.
The vulnerability is a result of the application's failure to properly sanitize user input. As a result, a remote attacker can send a crafted query to execute arbitrary code on a vulnerable server.
Accellion File Transfer version FTA_9_11_200 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Please contact the vendor at the website below for updates to resolve this issue.