The WooCommerce Support Ticket System plugin for WordPress is vulnerable to unauthorized access and loss of data due to missing capability checks on the 'ajax_delete_message', 'ajax_get_customers_partial_list', and 'ajax_get_admins_list' functions in all versions up to, and including, 17.8. This makes it possible for authenticated attackers, with Subscriber-level access and above, to delete arbitrary posts, and read names, emails, and capabilities of all users.
The product does not perform an authorization check when an actor attempts to access a resource or perform an action.