PHP remote file inclusion vulnerability in includes/functions_mod_user.php in the ACP User Registration (MMW) 1.00 module for phpBB allows remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter.
https://www.exploit-db.com/exploits/2551
https://exchange.xforce.ibmcloud.com/vulnerabilities/29571
http://www.securityfocus.com/bid/20558