Ticket #16293: 16293.2.diff

users.php

@@ -97 +97 @@
                         check_admin_referer( 'deleteuser' );
 
                         $id = intval( $_GET['id'] );
-                        if ( $id != '0' && $id != '1' ) {
+                        $user = get_userdata( $id );
+                        if ( ! is_super_admin( $id ) || ( $user->user_email != get_site_option( 'admin_email' ) && get_current_user_id() != $id && count( get_super_admins() ) > 1 ) ) {
                                 $_POST['allusers'] = array( $id ); // confirm_delete_users() can only handle with arrays
                                 $title = __( 'Users' );
                                 $parent_file = 'users.php';