MC4WP: Mailchimp for WordPress < 4.14.1 - Reflected XSS via 'data' Dynamic Content Tag

Description

The plugin is vulnerable to Reflected Cross-Site Scripting via 'data' Dynamic Content Tag due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that execute if they can successfully trick a user into performing an action such as clicking on a link.