Directory traversal vulnerability in admin/admin_hacks_list.php in Nivisec Hacks List 1.20 and earlier for phpBB, when register_globals is enabled, allows remote attackers to read arbitrary files via a ".." in the phpEx parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26840
http://www.vupen.com/english/advisories/2006/2034
http://www.securityfocus.com/bid/18162
http://www.securityfocus.com/archive/1/435285/100/0/threaded