Directory traversal vulnerability in the zM Ajax Login & Register plugin before 1.1.0 for WordPress allows remote attackers to include and execute arbitrary php files via a relative path in the template parameter in a load_template action to wp-admin/admin-ajax.php.
https://wordpress.org/plugins/zm-ajax-login-register/changelog/
https://security.gentoo.org/glsa/201512-10
http://www.securityfocus.com/bid/75041
http://www.securityfocus.com/archive/1/535682/100/0/threaded