Input validation vulnerability in Email Subscription Popup 1.2.22

The Email Subscription Popup plugin for WordPress has a security issue that allows hackers to inject harmful code into the plugin’s print_email_subscribe_form feature. This can happen on any version of the plugin up to version 1.2.22 because it does not properly filter and protect user-supplied information. This means that someone with contributor-level access or higher can insert dangerous code into pages that will run whenever a user opens that page.