This indicates an attack attempt to exploit an Authentication Bypass Vulnerability in WordPress Plugin CRUDLab WP Like Button.
The vulnerability is due to an error in the vulnerable application when handling a maliciously crafted HTTP request. An attacker can exploit this to gain administrator privileges in the affected system.
CRUDLab WP Like Button plugin through 1.6.0
System Compromise: Remote attackers can gain control of vulnerable systems.
Apply the most recent upgrade or patch from the vendor: