W3Mail 1.0.2 through 1.0.5 with server side scripting (SSI) enabled in the attachments directory does not properly restrict the types of files that can be uploaded as attachments, which allows remote attackers to execute arbitrary code by sending code in MIME attachments, then requesting the attachments.

Directory traversal vulnerability in viewAttachment.cgi in W3Mail 1.0.6 allows remote attackers to read arbitrary files via a .. (dot dot) in the file parameter.