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HTB22891: XSS in Rating-Widget wordpress plugin

Vulnerability ID: HTB22891
Reference: http://www.htbridge.ch/advisory/xss_in_rating_widget_wordpress_plugin_2.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/save.php" script to properly sanitize user-supplied input in "rw_form_hidden_field_name" 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: