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HTB22947: XSS in Ajax Category Dropdown wordpress plugin

Vulnerability ID: HTB22947
Reference: http://www.htbridge.ch/advisory/xss_in_ajax_category_dropdown_wordpress_plugin.html
Product: Ajax Category Dropdown wordpress plugin
Vendor: http://www.dyasonhat.com/ ( http://www.dyasonhat.com/ ) 
Vulnerable Version: 0.1.5
Vendor Notification: 07 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:
User can execute arbitrary JavaScript code within the vulnerable application.
The vulnerability exists due to failure in the "/wp-content/plugins/ajax-category-dropdown/includes/dhat-ajax-cat-dropdown-request.php" script to properly sanitize user-supplied input in "category_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.

The following PoC is available: