The Email Subscribers by Icegram Express – Email Marketing, Newsletters, Automation for WordPress & WooCommerce plugin for WordPress is vulnerable to unauthorized API access due to a missing capability check in all versions up to, and including, 5.7.26. This makes it possible for authenticated attackers, with Subscriber-level access and above, to access the API (provided it is enabled) and add, edit, and delete audience users.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.