XSS vulnerability in BLOG:CMS

Vulnerability ID: HTB22724
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_blogcms.html
Product: BLOG:CMS
Vendor: Radek Hulan ( http://blogcms.com/ )
Vulnerable Version: 4.2.1.e and probably prior versions
Vendor Notification: 30 November 2010
Vulnerability Type: Stored XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted
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 "action.php" script to properly sanitize user-supplied input in "body" 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. Enter comment like <script>alert('XSS')</script> in "Add new comment" form.