source: http://www.securityfocus.com/bid/22052/info
 
InstantForum.NET is prone to multiple cross-site scripting vulnerabilities because the application fails to sufficiently sanitize user-supplied input.
 
An attacker can exploit these issues to steal cookie-based authentication credentials and launch other attacks.
 
These issues affect version 4.1.0; other versions may also be affected. 

http://www.example.com/Forums-Path/Members1.aspx?Username=[xss]
http://www.example.com/Forums-Path/Members1.aspx?Update=[xss]