source: http://www.securityfocus.com/bid/15537/info
 
OTRS is prone to multiple input-validation vulnerabilities. These issues are due to a failure in the application to properly sanitize user-supplied input.
 
The application is prone to multiple SQL-injection vulnerabilities, an HTML-injection vulnerability, and multiple cross-site scripting vulnerabilities. 

http://www.example.com/admin/index.pl?Action=AgentTicketPlain&ArticleID=1&TicketID=1%20[SQL_HERE]
http://www.example.com/admin/index.pl?Action=AgentTicketPlain&TicketID=1&ArticleID=1%20[SQL_HERE]