This indicates an attack attempt against a Local File Include vulnerability in Easy Px 41 CMS.
The vulnerability exists because the affected software fails to properly sanitize user-supplied input. This could allow remote attackers to execute arbitrary code via sending a crafted web page.
Easy PX 41 CMS 09.00.00B1
System Compromise: Remote attackers can gain control of vulnerable systems.
Update to latest version 09.05.28.