PHP remote file inclusion vulnerability in includes/functions.php in Phpbb Tweaked 3 and earlier allows remote attackers to execute arbitrary PHP code via a URL in the phpbb_root_path parameter.
https://www.exploit-db.com/exploits/3235
https://exchange.xforce.ibmcloud.com/vulnerabilities/32024
http://www.xoron.info/bugs/phpbbtweaked.txt
http://www.vupen.com/english/advisories/2007/0451