The remote host is vulnerable to a SQL Injection attack.
The remote host is running MercuryBoard, a web-based message board written in PHP. This version of MercuryBoard is vulnerable to a remote SQL Injection flaw. An attacker exploiting this flaw would send a malformed HTTP query to the application. Successful exploitation would result in the attacker being able to read or write confidential data. In addition, the attacker may be able to execute arbitrary code on the remote database server.
Upgrade or patch according to vendor recommendations.