phptonuke.php in myPHPNuke 1.8.8 allows remote attackers to read arbitrary files via a full pathname in the filnavn variable.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2002-1892
http://www.securityfocus.com/bid/5982
http://www.iss.net/security_center/static/10396.php
http://archives.neohapsis.com/archives/bugtraq/2002-10/0225.html