The web mail service in Woppoware PostMaster 4.2.2 (build 3.2.5) generates different error messages depending on whether a user exists or not, which allows remote attackers to determine valid usernames.

message.htm for Woppoware PostMaster 4.2.2 (build 3.2.5) allows remote attackers to bypass authentication by modifying the email parameter.

Directory traversal vulnerability in message.htm for Woppoware PostMaster 4.2.2 (build 3.2.5) allows remote attackers to determine the existence of arbitrary files via a .. (dot dot) in the wmm parameter.

Cross-site scripting (XSS) vulnerability in message.htm for Woppoware PostMaster 4.2.2 (build 3.2.5) allows remote attackers to inject arbitrary web script or HTML via the email parameter.