HTB22890: XSS in Rating-Widget wordpress plugin

Vulnerability ID: HTB22890
Reference: http://www.htbridge.ch/advisory/xss_in_rating_widget_wordpress_plugin_1.html
Product: Rating-Widget wordpress plugin
Vendor: Vova Feldman ( http://rating-widget.com/ )
Vulnerable Version: 1.3.1
Vendor Notification: 03 March 2011
Vulnerability Type: XSS (Cross Site Scripting)
Risk level: Medium
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/)

Vulnerability Details:
The vulnerability exists due to failure in the "/wp-content/plugins/rating-widget/view/rating.php" script to properly sanitize user-supplied input in "vars" variable when register_globals is on.
User can execute arbitrary JavaScript code within the vulnerable application.
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.

The following PoC is available:

http://[host]/wp-content/plugins/rating-widget/view/rating.php?vars[type]=%22%3E%3Cscript%3Ealert%28document.cookie%29%3C/script%3E