CVE-2026-3237: In affected versions of Octopus Server it was possible for a low privileged user to manipulate an API request

Routine

MEDIUM 4.3UPGRADE

CVE-2026-3237 is a medium-severity flaw (CVSS 4.3) affecting octopus server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 95%)
CISA exploited list	No
Weakness	CWE-285
Published	2026-03-17
Last modified	2026-06-17

Publisher (CNA): Octopus Deploy · Vendor: octopus

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-17 07:16 UTCPublished CVE record published
2026-06-17 10:43 UTCUpdated Record last modified

octopus octopus server UPGRADE

Affected: < 2025.3.14731 · >= 2025.4.51 and < 2025.4.10359 · >= 2026.1.675 and < 2026.1.5571

Fixed in: 2025.3.14731, 2025.4.10359, 2026.1.5571

Safe to downgrade to: a release before 2025.4.51

1. Check installed version

apt-cache policy octopus-server || rpm -q octopus-server || octopus-server --version

2. UPGRADE to 2025.3.14731 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade octopus-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade octopus-server

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 2025.4.51 (Debian / Ubuntu)

apt-cache madison octopus-server sudo apt install octopus-server=<VERSION_BEFORE_2025.4.51> sudo apt-mark hold octopus-server

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list octopus-server sudo dnf downgrade octopus-server-<VERSION_BEFORE_2025.4.51> sudo dnf versionlock add octopus-server

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-3237?

octopus server: upgrade to 2025.3.14731, 2025.4.10359, 2026.1.5571. Exact commands for each OS are on this page.

Is CVE-2026-3237 being exploited?

CVE-2026-3237 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-3237 affect?

CVE-2026-3237 affects octopus server. Severity is medium (CVSS 4.3). 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 w

How urgent is CVE-2026-3237?

Priority 16/100. No elevated risk signals yet.

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References

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