Wordpress W3 Total Cache Cross Site Scripting Vulnerability

Summary
This host is installed with Wordpress W3 Total Cache 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. Impact Level: Application
Solution
Upgrade to version 0.9.4.1 or higher, For updates refer https://wordpress.org/plugins/w3-total-cache
Insight
Flaw is due to improper validation of input that contains the Cache Key and is passed via the URL before returning it to users.
Affected
Wordpress W3 Total Cache version before 0.9.4.1
Detection
Send a crafted data via HTTP GET request and check whether it is able to read cookie or not.
References