Directory traversal vulnerability in index.php for FlatNuke 2.5.6 allows remote attackers to read arbitrary files via ".." sequences in the (1) user parameter in a profile operation or (2) quale parameter in a newtopic operation.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-3306
http://www.vupen.com/english/advisories/2005/2178
http://www.securityfocus.com/bid/15172