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

Octopus before 3.17.7 allows attackers to obtain sensitive cleartext information by reading a variable JSON file in certain situations involving Offline Drop Targets.

An issue was discovered in Octopus before 3.17.7. When the special Guest user account is granted the CertificateExportPrivateKey permission, and Guest Access is enabled for the Octopus Server, an attacker can sign in as the Guest account and export Certificates managed by Octopus, including the private key.

In Octopus before 3.17.7, an authenticated user who was explicitly granted the permission to invite new users (aka UserInvite) can invite users to teams with escalated privileges.

Cross-site scripting (XSS) vulnerability in Octopus Deploy 3.7.0-3.17.13 (fixed in 3.17.14) allows remote authenticated users to inject arbitrary web script or HTML via the Step Template Name parameter.

Cross-site scripting (XSS) vulnerability in the All Variables tab in Octopus Deploy 3.4.0-3.13.6 (fixed in 3.13.7) allows remote attackers to inject arbitrary web script or HTML via the Variable Set Name parameter.

In Octopus Deploy before 4.1.3, the machine update process doesn't check that the user has access to all environments. This allows an access-control bypass because the set of environments to which a machine is scoped may include environments in which the user lacks access.

In Octopus Deploy 3.x before 3.15.4, an authenticated user with PackagePush permission to upload packages could upload a maliciously crafted NuGet package, potentially overwriting other packages or modifying system files. This is a directory traversal in the PackageId value.

In Octopus Server after version 2022.1.1495 and before 2022.1.2647 if private spaces were enabled via the experimental feature flag all new users would have access to the Script Console within their private space.

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.

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

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 2020.3.x before 2020.3.4 and 2020.4.x before 2020.4.1, if an authenticated user creates a deployment or runbook process using Azure steps and sets the step's execution location to run on the server/worker, then (under certain circumstances) the account password is exposed in cleartext in the verbose task logs output.

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.

An Information Exposure issue in the Terraform deployment step in Octopus Deploy before 2019.1.8 (and before 2018.10.4 LTS) allows remote authenticated users to view sensitive Terraform output variables via log files.

In Octopus Deploy before 2019.10.6, an authenticated user with TeamEdit permission could send a malformed Team API request that bypasses input validation and causes an application level denial of service condition. (The fix for this was also backported to LTS 2019.9.8 and LTS 2019.6.14.)