What is CVE-2026-3236?

CVE-2026-3236 is a medium-severity vulnerability in Octopus Server, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-03-05.

How severe is CVE-2026-3236?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Auth bypass in Octopus Server

CVE-2026-3236

In affected versions of Octopus Server it was possible to create a new API key from an existing access token resulting in the new API key having a lifetime exceeding the original API key used to mint the access token.

Vulnerability class: Broken Access Control

Published 2026-03-05 · last modified 2026-06-17.

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.

EPSS exploit prediction

EPSS: 0.003 (15.3th percentile), scored 2026-09-28.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 15th percentile — 15.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001

Affected products

Octopus Server
Octopus Deploy Server — versions 2023.0.0, 2025.4.0

Weakness classification (CWE)

CWE-863 — Incorrect Authorization

References

advisories.octopus.com/post/2026/sa2026-02 (Vendor Advisory)

Frequently asked questions

What is CVE-2026-3236?: CVE-2026-3236 is a medium-severity vulnerability in Octopus Server, classified under Incorrect Authorization. CVSS score: 4.3/10. Published 2026-03-05.
How severe is CVE-2026-3236?: Medium severity. CVSS v3 base score is 4.3 out of 10.