In Octopus Deploy 2018.8.0 through 2018.9.x before 2018.9.1, an authenticated user with permission to modify deployment processes could upload a maliciously crafted YAML configuration, potentially allowing for remote execution of arbitrary code, running in the same context as the Octopus Server (for self-hosted installations by default, SYSTEM).

In Octopus Deploy version 2018.5.1 to 2018.5.7, a user with Task View is able to view a password for a Service Fabric Cluster, when the Service Fabric Cluster target is configured in Azure Active Directory security mode and a deployment is executed with OctopusPrintVariables set to True. This is fixed in 2018.6.0.

In Octopus Deploy 2018.4.4 through 2018.5.1, Octopus variables that are sourced from the target do not have sensitive values obfuscated in the deployment logs.