Frams's Fast File EXchange (F*EX, aka fex) 20100208, and possibly other versions before 20110610, allows remote attackers to bypass authentication and upload arbitrary files via a request that lacks an authentication ID.
https://exchange.xforce.ibmcloud.com/vulnerabilities/68005
http://www.securityfocus.com/bid/48239
http://www.debian.org/security/2011/dsa-2259