This indicates an attack attempt to exploit an Arbitrary File Upload vulnerability in Ahsay Backup.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling a craft HTTP request. An authenticated remote attacker may be able exploit this to upload, to download, and to execute arbitrary code within the context of the application.
Ahsay Backup version 188.8.131.52 and prior
System Compromise: Remote attackers can gain control of vulnerable systems.
Currently we are unaware of any vendor supplied patch for this issue.