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.
In Octopus Deploy 2019.7.3 through 2019.7.9, in certain circumstances, an authenticated user with VariableView permissions could view sensitive values. This is fixed in 2019.7.10.