This indicates an attack attempt to exploit a Remote File Inclusion vulnerability in various PHP applications.
The vulnerability is due to insufficient sanitizing of user supplied inputs in the application when handling "mosConfig_absolute_path" parameter. A remote attacker may be able exploit this to execute arbitrary code within the context of the application.
all vulnerable PHP applications
System Compromise: Remote attackers can gain control of vulnerable systems.
Refer to each individual affected vendor's website for updates or workaround.