PHP Advanced Transfer Manager (phpATM) 1.21 allows remote attackers to upload arbitrary files via filenames containing multiple file extensions, as demonstrated using a filename ending in "php.ns", which allows execution of arbitrary PHP code.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2005-1607
http://www.securityfocus.com/bid/13542
http://www.securityfocus.com/archive/1/415300/30/0/threaded
http://www.securityfocus.com/archive/1/415172