Directory traversal vulnerability in viewfile in TWiki 4.0.0 through 4.0.4 allows remote attackers to read arbitrary files via a .. (dot dot) in the filename parameter.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2006-4282
http://www.vupen.com/english/advisories/2006/3524
http://www.securityfocus.com/bid/19907
http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2006-4294