Cross-site scripting (XSS) vulnerability in mailpost.exe in MailPost 5.1.1sv, and possibly earlier versions, when debug mode is enabled, allows remote attackers to execute arbitrary web script or HTML via the append parameter.

mailpost.exe in MailPost 5.1.1sv, and possibly earlier versions, allows remote attackers to cause a denial of service (server crash), leak sensitive pathname information in the resulting error message, and execute a cross-site scripting (XSS) attack via an HTTP request that contains a / (backslash) and arbitrary webscript before the requested file, which leaks the pathname and does not quote the script in the resulting Visual Basic error message.

MailPost 5.1.1sv, and possibly earlier versions, displays a different error message depending on whether the requested file exists or not, which allows remote attackers to gain sensitive information.

MailPost 5.1.1sv, and possibly earlier versions, when debug mode is enabled, allows remote attackers to gain sensitive information via the debug parameter, which reveals information such as the path to the web root and the web server version.