In affected versions of Octopus Deploy it is possible to unmask variable secrets using the variable preview function

In affected Octopus Server versions when the server HTTP and HTTPS bindings are configured to localhost, Octopus Server will allow open redirects.

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.

In Octopus Deploy through 2020.4.2, an attacker could redirect users to an external site via a modified HTTP Host header.

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 3.1.0 to 2020.4.0, certain scripts can reveal sensitive information to the user in the task logs.

In Octopus Deploy 2018.8.0 through 2019.x before 2019.12.2, an authenticated user with could trigger a deployment that leaks the Helm Chart repository password.

In Octopus Deploy before 2019.12.9 and 2020 before 2020.1.12, the TaskView permission is not scoped to any dimension. For example, a scoped user who is scoped to only one tenant can view server tasks scoped to any other tenant.

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.