When configuring Octopus Server if it is configured with an external SQL database, on initial configuration the database password is written to the OctopusServer.txt log file in plaintext.

Cleartext storage of sensitive information in multiple versions of Octopus Server where in certain situations when running import or export processes, the password used to encrypt and decrypt sensitive values would be written to the logs in plaintext.

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.

In Octopus Tentacle versions 3.0.8 to 5.0.0, when a web request proxy is configured, an authenticated user (in certain limited OctopusPrintVariables circumstances) could trigger a deployment that writes the web request proxy password to the deployment log in cleartext. This is fixed in 5.0.1. The fix was back-ported to 4.0.7.

In Octopus Deploy versions 2018.8.4 to 2019.7.6, when a web request proxy is configured, an authenticated user (in certain limited special-characters circumstances) could trigger a deployment that writes the web request proxy password to the deployment log in cleartext. This is fixed in 2019.7.7. The fix was back-ported to LTS 2019.6.7 as well as LTS 2019.3.8.