In Octopus Deploy 3.4.x before 2018.4.7, an authenticated user is able to view/update/save variable values within the Tenant Variables area for Environments that do not exist within their associated Team scoping. This occurs in situations where this authenticated user also belongs to multiple teams, where one of the Teams has the VariableEdit permission or VariableView permissions for the Environment.

A persistent cross-site scripting (XSS) vulnerability in Octopus Server 3.4.0 through 2019.10.5 allows remote authenticated attackers to inject arbitrary web script or HTML.

An issue was discovered in Octopus Deploy 3.4. A deployment target can be configured with an Account or Certificate that is outside the scope of the deployment target. An authorised user can potentially use a certificate that they are not in scope to use. An authorised user is also able to obtain certificate metadata by associating a certificate with certain resources that should fail scope validation.