When Octopus Server is installed using a custom folder location, folder ACLs are not set correctly and could lead to an unprivileged user using DLL side-loading to gain privileged access.
An issue was discovered in Octopus Deploy through 2020.4.4. If enabled, the websocket endpoint may allow an untrusted tentacle host to present itself as a trusted one.
In Octopus Deploy before 2020.1.5, for customers running on-premises Active Directory linked to their Octopus server, an authenticated user can leverage a bug to escalate privileges.