This indicates an attack attempt to exploit a SQL Injection vulnerability in Joomla Huge-IT Image Gallery Extension.
The vulnerability is due to 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.
Joomla Huge-IT Image Gallery Extension v1.1.5 and earlier
System Compromise: Remote attackers can execute arbitrary SQL commands on affected machines
Apply the most recent upgrade or patch from the vendor.