functions.php

<?php

/**
 * Display Posts - URL Query Parameters 
 *
 */
function be_dps_url_query_params( $args ) {
  $approved_params = array( 'orderby', 'order' );
  foreach( $approved_params as $param ) {
   if( !empty( $_GET[ $param ] ) )
      $args[ $param ] = esc_attr( $_GET[ $param ] );
  }
  return $args;
}
add_filter( 'display_posts_shortcode_args', 'be_dps_url_query_params' );