The remote host is vulnerable to a SQL injection attack.
The remote host is running Plesk. Plesk is a web-based administrative console written in PHP. This version of Plesk is vulnerable to a flaw in the way that it handles the 'PLESKSESSID' cookie when passed via the 'login.php3' and 'auth.php3' scripts. An attacker exploiting this flaw would only need to be able to send HTTP requests to the vulnerable application. Successful exploitation would result in the attacker executing arbitrary SQL commands on the remote database server utilized by Plesk.
Upgrade to a version of Plesk other than 7.6.1, 8.1.0, 8.1.1 and 8.2.0.