This indicates an attempt to exploit a Remote File Include vulnerability in WordPress Plugin Sniplets.
The vulnerability is caused by an error that occurs when the vulnerable software handles a malicious request. It allows a remote attacker to execute arbitrary code via sending a crafted web page.
Sniplets 1.1.2 and 1.2.2 plugin for WordPress
System Compromise: Remote attackers can gain control of vulnerable systems.
Improve the web page back-end source code to verify client requests properly.