Directory traversal vulnerability in login.php in Maia Mailguard 1.0.2 and earlier allows remote attackers to read arbitrary files via a .. (dot dot) in the lang parameter.
http://www.vupen.com/english/advisories/2007/2456
http://www.securitytracker.com/id?1018338
http://www.securityfocus.com/archive/1/472886/100/0/threaded
http://www.netragard.com/pdfs/research/NETRAGARD-20070628-MAILGUARD.txt
http://www.maiamailguard.org/maia/ticket/479
http://www.maiamailguard.org/maia/changeset/1184
http://securityreason.com/securityalert/2864