The remote web server contains a script that is vulnerable to a SQL injection attack.
The remote host is running Invision Board, a CGI suite designed to set up a bulletin board system on the remote web server. This version of Invision Board is vulnerable to a flaw in the way that it handles the 'st' parameter of the 'showtopic' php script. Successful exploitation may allow an attacker to execute arbitrary SQL statements against the remote host.
Upgrade or patch according to vendor recommendations.