Absolute path traversal vulnerability in Font.php in the Font plugin before 7.5.1 for WordPress allows remote administrators to read arbitrary files via a full pathname in the url parameter to AjaxProxy.php.
https://wpvulndb.com/vulnerabilities/8214
https://wordpress.org/plugins/font/changelog/
http://www.securityfocus.com/archive/1/536670/100/0/threaded