XSS vulnerability in Prado Portal

Vulnerability ID: HTB22515
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_prado_portal.html
Product: Prado Portal
Vendor: Compudesign ApS ( http://www.pradoportal.dk/ )
Vulnerable Version: 1.2.0 and Probably Prior Versions
Vendor Notification: 22 July 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 "index.php" script to properly sanitize user-supplied input in "page" 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:

http://host/index.php?page=x<img+src%3Dx+onerror%3Dalert(document.cookie)>