Directory traversal vulnerability in forum/irc/irc.php in the PJIRC 0.5 module for phpBB allows remote attackers to include and execute arbitrary local files via a .. (dot dot) in the phpEx parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/41456
https://euvd.enisa.europa.eu/vulnerability/EUVD-2008-1566
http://www.securityfocus.com/bid/28446
http://www.securityfocus.com/archive/1/490070/100/0/threaded