Ticket #20356: 20356.patch

wp-includes/class-wp-xmlrpc-server.php

@@ -3615 +3615 @@
                                         return(new IXR_Error(401, __('Invalid post type.')));
                                         break;
                         }
+                        $author = get_userdata( $content_struct['wp_author_id'] );
+                        if ( ! $author )
+                                return new IXR_Error( 404, __( 'Invalid author ID.' ) );
                         $post_author = $content_struct['wp_author_id'];
                 }