Wordpress MailUp Plugin Multiple Vulnerabilities

Summary
This host is installed with Wordpress MailUp Plugin and is prone to multiple vulnerabilities.
Impact
Successful exploitation will allow remote attackers to execute arbitary HTML or web script via unspecified vectors in a user's browser session in context of an affected site and disclose sensitive information. Impact Level: Application
Solution
Upgrade Wordpress MailUp Plugin 1.3.2 or later, For updates refer to http://wordpress.org/extend/plugins/wp-mailup
Insight
Not properly restrict access to unspecified Ajax functions in ajax.functions.php
Affected
Wordpress MailUp Plugin version 1.3.1 and prior
References