Input validation vulnerability in N-Media MailChimp Subscription 5.4

A plugin called Nmedia MailChimp, used with WordPress, has a security issue called Stored Cross-Site Scripting. This happens in versions up to 5.4 because the plugin does not properly clean up the information it receives or sends out. This means that someone who has access to the plugin and is logged in as a subscriber or higher can add harmful code to a webpage, which will run when someone visits that page.