XSS vulnerability in EasyPublish CMS

Vulnerability ID: HTB22356
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_easypublish_cms.html
Product: EasyPublish CMS
Vendor: Escio AS
Vulnerable Version: Current at 23.04.2010 and Probably Prior Versions
Vendor Notification: 23 April 2010
Vulnerability Type: XSS (Cross Site Scripting)
Status: Fixed by Vendor
Risk level: Medium
Credit: High-Tech Bridge SA (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 URL. 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/?%22%3E%3Cb%3E%3Cscript%3Ex=document;alert%28x.cookie%29%3C/script%3E

Solution: Upgrade to the most recent verison