In affected versions of Octopus Server where access is managed by an external authentication provider, it was possible that the API key/keys of a disabled/deleted user were still valid after the access was revoked.
In affected versions of Octopus Server it is possible to reveal the existence of resources in a space that the user does not have access to due to verbose error messaging.
In affected versions of Octopus Server it is possible for a session token to be valid indefinitely due to improper validation of the session token parameters.