When generating a user invitation code in Octopus Server, the validity of this code can be set for a specific number of users. It was possible to bypass this restriction of validity to create extra user accounts above the initial number of invited users.
In Octopus Server after version 2018.8.2 if the Octopus Server Web Request Proxy is configured with authentication, the password is shown in plaintext in the UI.
An Information Exposure issue in the Terraform deployment step in Octopus Deploy before 2019.1.8 (and before 2018.10.4 LTS) allows remote authenticated users to view sensitive Terraform output variables via log files.