editor/filemanager/upload/php/upload.php in FCKeditor before 2.3 Beta, when the upload feature is enabled, does not verify the Type parameter, which allows remote attackers to upload arbitrary file types. NOTE: It is not clear whether this is related to CVE-2006-0658.
http://www.vupen.com/english/advisories/2006/1856
http://www.securityfocus.com/bid/18029