XSS vulnerability in Expression CMS

[advisory@xxxxxxxxxxx]

Vulnerability ID: HTB22617
Reference: 
http://www.htbridge.ch/advisory/xss_vulnerability_in_expression_cms.html
Product: Expression 
Vendor: Backbone Technology ( http://www.backbonetechnology.com ) 
Vulnerable Version: Current at 18.09.2010 and Probably Prior Versions
Vendor Notification: 22 September 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 "contact us" page to properly 
sanitize user-supplied input in "section_id" 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/?section_id=1002815%27%22%3E%3Cscript%3Ealert%28/XSS/%29%3C/script%3E