Auth bypass in Octopus Server
CVE-2026-3237
In affected versions of Octopus Server it was possible for a low privileged user to manipulate an API request to change the signing key expiration and revocation time frames via an API endpoint that had incorrect permission validation. It was not possible to expose the signing keys using this vulnerability.
EPSS: 0.002 (4.9th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
Affected products
- Octopus Octopus_server
- Octopus Deploy Server — versions 2023.0.0, 2025.4.0, 2026.1.0
Weakness classification (CWE)
References
- security@octopus.com (Vendor Advisory)
Frequently asked questions
- What is CVE-2026-3237?
- CVE-2026-3237 is a medium-severity vulnerability in Octopus Server, classified under Improper Authorization. CVSS score: 4.3/10. Published 2026-03-17.
- How severe is CVE-2026-3237?
- Medium severity. CVSS v3 base score is 4.3 out of 10.