It was identified that in certain versions of Octopus Server, that a user created with no permissions could view all users, user roles and permissions. This functionality was removed in versions of Octopus Server after the fixed versions listed.
In affected versions of Octopus Server it is possible for the OpenID client secret to be logged in clear text during the configuration of Octopus Server.
In affected versions of Octopus Deploy it is possible for a low privileged guest user to craft a request that allows enumeration/recon of an environment.