This indicates an attack attempt to exploit a SQL injection vulnerability in Sefrengo CMS.
The vulnerability is a result of the application's failure to properly sanitize user input before using it in a SQL query. As a result, a remote attacker can send a crafted query to execute SQL commands on a vulnerable server.
Sefrengo CMS before 1.6.2
System Compromise: Remote attackers can gain control of vulnerable systems.
Upgrade to the latest version, available from the web site.