CVE-2018-18850: Octopus Server

High severity, CVSS 8.8. EPSS: 12.5% chance of exploitation in the next 30 days.

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).

Affected products

• Octopus Octopus Server: from 2018.8.0, up to and including 2018.8.12; from 2018.9.0, before 2018.9.1 (fixed in 2018.9.1)

Published 2018-10-31. Last modified 2026-06-17.