WorldClient.dll in Alt-N MDaemon and WorldClient 8.1.3 trusts a Session parameter that contains a randomly generated session ID that is associated with a username, which allows remote attackers to perform actions as other users by guessing or sniffing the random value.

The WDaemon web server for WorldClient 2.1 allows remote attackers to read arbitrary files via a .. (dot dot) attack.

Directory traversal vulnerability in WorldClient.cgi in WorldClient for Alt-N Technologies MDaemon 5.0.5.0 and earlier allows local users to delete arbitrary files via a ".." (dot dot) in the Attachments parameter.

Buffer overflow in WorldClient.cgi in WorldClient in Alt-N Technologies MDaemon 5.0.5.0 and earlier allows local users to execute arbitrary code via a long folder name (NewFolder parameter).

WorldClient webmail in Alt-N MDaemon 8.1.3 allows remote attackers to prevent arbitrary users from accessing their inboxes via script tags in the Subject header of an e-mail message, which prevents the user from being able to access the Inbox folder, possibly due to a cross-site scripting (XSS) vulnerability.

Cross-site scripting (XSS) vulnerability in Alt-N MDaemon WorldClient 10.0.2, when Internet Explorer 7 is used, allows remote attackers to inject arbitrary web script or HTML via a crafted img tag.

Multiple unspecified vulnerabilities in WorldClient in Alt-N MDaemon before 10.02 have unknown impact and attack vectors, probably related to cross-site scripting (XSS) and WorldClient DLL 10.0.1, a different vulnerability than CVE-2008-6893.