This indicates an attack attempt to exploit a Code Injection vulnerability in ProjeQtOr.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling a crafted HTTP request. An attacker may be able to exploit this to upload a file and execute arbitrary code within the context of the application, via a crafted HTTP request.
ProjeQtOr 7.2.5 and prior
System Compromise: Remote attackers can execute arbitrary code on vulnerable systems.
Currently we are unaware of any vendor supplied patch or updates available for this issue.