Ticket #33763: 33763.diff

src/wp-admin/edit.php

@@ -9 +9 @@
 /** WordPress Administration Bootstrap */
 require_once( dirname( __FILE__ ) . '/admin.php' );
 
-if ( ! $typenow )
+if ( ! $typenow || ! in_array( $typenow, get_post_types( array( 'show_ui' => true ) ) ) ) {
         wp_die( __( 'Invalid post type' ) );
+}
 
 if ( 'attachment' === $typenow ) {
         if ( wp_redirect( admin_url( 'upload.php' ) ) ) {