global $post;
$this_post_tags_ids = wp_get_post_tags( $post->ID, array( 'fields' => 'ids' ) );

$query = new WP_Query( array( 'tag__in' => $this_post_tag_ids ) );
if ($query->have_posts()){
   while($query->have_posts()){
      $query->the_post();
      echo the_title('<h3><a href="'.get_the_permalink.'"/>', '</a></h3>');
   }
}