Joomla Component Youtube Gallery Cross Site Scripting Vulnerability

Summary
This host is installed with Joomla! component youtube gallery and is prone to cross site scripting vulnerability.
Impact
Successful exploitation will allow remote attackers to execute arbitrary HTML and script code in a users browser session in the context of an affected site and launch other attacks. Impact Level: Application
Solution
Upgrade to Joomla Youtube Gallery version 3.8.4 or later. For updates refer to http://www.joomlaboat.com/youtube-gallery
Insight
The flaw is due to insufficient validation of 'videofile' HTTP GET parameter passed to '/includes/flvthumbnail.php' script.
Affected
Joomla Youtube Gallery version 3.4.0 and probably other versions.
Detection
Send a crafted data via HTTP GET request and check whether it is able to read cookie or not.
References