Directory traversal vulnerability in readmsg.php in WebMail 2.0.1 in Cobalt Qube 3 allows remote attackers to read arbitrary files via a .. (dot dot) in the mailbox parameter.
https://exchange.xforce.ibmcloud.com/vulnerabilities/6805
http://archives.neohapsis.com/archives/bugtraq/2001-08/0245.html
http://archives.neohapsis.com/archives/bugtraq/2001-07/0092.html