GoAhead Web Server 2.18 - 'adduser.asp' Multiple Cross-Site Scripting Vulnerabilities

source: https://www.securityfocus.com/bid/50039/info
  
GoAhead WebServer is prone to multiple HTML-injection vulnerabilities because it fails to properly sanitize user-supplied input.
  
Successful exploits will allow attacker-supplied HTML and script code to run in the context of the affected browser, potentially allowing the attacker to steal cookie-based authentication credentials or to control how the site is rendered to the user. Other attacks are also possible.
  
GoAhead WebServer 2.18 is vulnerable; other versions may also be affected. 

POST /goform/AddUser HTTP/1.1
user=%3Cscript%3Ealert%281337%29%3C%2Fscript%3E&group=%3Cscript%3Ealert%281337%2
9%3C%2Fscript%3E&enabled=on&password=test&passconf=test&ok=OK