The WPFront User Role Editor plugin for WordPress is vulnerable to Sensitive Information Exposure in all versions up to, and including, 3.2.1.11184 via the wpfront_user_role_editor_assign_roles_user_autocomplete AJAX action. This makes it possible for authenticated attackers, with subscriber-level access and above, to extract retrieve a list of all user email addresses who are registered on the site.
The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information.