I noticed that http://domain.tld/wp-content/themes/enfold/ was indexed by Google and that it on that URL was shown: Fatal error: Call to undefined function get_header() in /dummy/wp-content/themes/enfold/index.php on line 11
This error can be prevented by adding:
if( !defined( 'ABSPATH' ) ) {
exit;
}
..right after the first PHP tag.
Seen in Enfold version 2.5.2