Input validation vulnerability in Easy Forms for Mailchimp 6.8.8

The Easy Forms for Mailchimp plugin for WordPress is not secure in versions up to 6.8.8. This means that someone with administrator-level access to the website, and on multi-site installations and installations where unfiltered_html has been disabled, can inject malicious code into a page. This code can execute whenever someone visits the page, potentially causing harm to the website or its users.