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HTB22868: XSS in 1 Flash Gallery wordpress plugin

Vulnerability ID: HTB22868
Reference: http://www.htbridge.ch/advisory/xss_in_1_flash_gallery_wordpress_plugin.html
Product: 1 Flash Gallery wordpress plugin
Vendor: 1plugin.com ( http://1plugin.com/ ) 
Vulnerable Version: 0.2.5
Vendor Notification: 22 February 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/1-flash-gallery/folder.php" script to properly sanitize user-supplied input in "type" 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: