The Popup – MailChimp, GetResponse and ActiveCampaign Intergrations plugin for WordPress is vulnerable to unauthorized loss of data due to a missing capability check on the 'upc_delete_db_data' AJAX action in all versions up to, and including, 3.2.6. This makes it possible for unauthenticated attackers to delete the DB data for the plugin.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.