SmarterTools SmarterMail 16.x before build 6985 allows deserialization of untrusted data. An unauthenticated attacker could run commands on the server when port 17001 was remotely accessible. This port is not accessible remotely by default after applying the Build 6985 patch.

SmarterTools SmarterMail 16.x through 100.x before 100.0.7803 allows remote code execution.

SmarterTools SmarterMail 16.x before build 6985 has hardcoded secret keys. An unauthenticated attacker could access other users’ emails and file attachments. It was also possible to interact with mailing lists.

SmarterTools SmarterMail 16.x before build 6985 allows directory traversal. An authenticated user could delete arbitrary files or could create files in new folders in arbitrary locations on the mail server. This could lead to command execution on the server for instance by putting files inside the web directories.

SmarterTools SmarterMail 16.x through 100.x before 100.0.7803 allows XSS.

SmarterTools SmarterMail 16.x before build 6995 has stored XSS. JavaScript code could be executed on the application by opening a malicious email or when viewing a malicious file attachment.