The IDonate – Blood Donation, Request And Donor Management System plugin for WordPress is vulnerable to Insecure Direct Object Reference via the admin_post_donor_delete() function in versions 2.0.0 to 2.1.9. By supplying an arbitrary user_id parameter value to the wp_delete_user() function, authenticated attackers, with Subscriber-level access and above could delete arbitrary user accounts, including those of administrators.
https://wordpress.org/plugins/idonate/#developers
https://plugins.trac.wordpress.org/browser/idonate/tags/2.1.9/src/Helpers/DonorFunctions.php#L658
https://plugins.trac.wordpress.org/browser/idonate/tags/2.1.9/src/Admin/Admin.php#L75