WordPress GarageSale plugin 'page' Parameter Cross Site Scripting Vulnerability

Summary
This host is installed with Wordpress GarageSale Plugin and is prone to cross site scripting vulnerability.
Impact
Successful exploitation will allow attacker to execute arbitrary HTML and script code in a user's browser session in the context of an affected site. Impact Level: Application
Solution
Upgrade to GarageSale plugin version 1.2.3 or later. For updates refer to http://www.eibler.at/garagesale
Insight
Input passed via the 'page' HTTP GET parameter to templates/printAdminUsersList_Footer.tpl.php script is not properly sanitised before returning to the user.
Affected
WordPress GarageSale plugin before version 1.2.3
Detection
Send a crafted data via HTTP GET request and check whether it is able to read cookie or not.
References