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HTB22875: XSS in Lazyest Gallery wordpress plugin

Vulnerability ID: HTB22875
Reference: http://www.htbridge.ch/advisory/xss_in_lazyest_gallery_wordpress_plugin.html
Product: Lazyest Gallery wordpress plugin
Vendor: Brimosoft  ( http://brimosoft.nl/ ) 
Vulnerable Version: 1.0.26
Vendor Notification: 24 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/lazyest-gallery/lazyest-popup.php" script to properly sanitize user-supplied input in "image" 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: