The plugin does not have authorisation and proper CSRF checks, allowing any authenticated users like subscriber to add any role to themselves, such as administrator
Easiest way to reproduce this is w/o the woocommerce plugin active, simply log on as a subscriber and go to the profile page (wp-admin/profile.php), tick the administrator role and update your profile
2022-10-10 (about 7 months ago)
2022-10-10 (about 7 months ago)
2022-10-10 (about 7 months ago)