WordPress Social Login 'xhrurl' Parameter XSS Vulnerability

Summary
This host is installed with WordPress Social Login 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 version 2.1.3 or higher, For updates refer to http://wordpress.org/plugins/wordpress-social-login
Insight
Input passed via the 'xhrurl' HTTP GET parameter to diagnostics.php script is not properly sanitised before returning to the user.
Affected
WordPress Social Login Plugin version 2.0.3, Other version may also be affected.
Detection
Send a crafted data via HTTP GET request and check whether it is able to read cookie or not.
References