Ticket #57678: 57678.diff

src/wp-admin/setup-config.php

@@ -322 +322 @@
                 }
 
                 $errors = $wpdb->suppress_errors();
-                $wpdb->query( "SELECT $prefix" );
+                $wpdb->prepare( "SELECT $prefix" );
                 $wpdb->suppress_errors( $errors );
 
                 if ( ! $wpdb->last_error ) {