CVE-2026-118426: In affected versions of Octopus Server with the LDAP authentication provider enabled, any authenticated user c

Routine

MEDIUM 5.3UPGRADE

CVE-2026-118426 is a medium-severity flaw (CVSS 5.3) 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 with the LDAP authentication provider enabled, any authenticated user could call the LDAP user search and LDAP group search.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
EPSS exploit chance	n/a
CISA exploited list	No
Weakness	CWE-862
Published	2026-10-29
Last modified	2026-10-29

Publisher (CNA): Octopus · Vendor: octopus deploy · Source: CVE Program record (NVD analysis pending)

Last updated 2026-10-29 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-10-29 02:02 UTCPublished CVE record published
2026-10-29 02:02 UTCUpdated Record last modified

octopus deploy octopus server UPGRADE

Affected: >= 3.0.0 and < 2026.2.13487 · >= 2026.3.0 and < 2026.3.15909

Fixed in: 2026.2.13487, 2026.3.15909

Safe to downgrade to: a release before 3.0.0

1. Check installed version

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

2. UPGRADE to 2026.2.13487 (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 3.0.0 (Debian / Ubuntu)

apt-cache madison octopus-server sudo apt install octopus-server=<VERSION_BEFORE_3.0.0> 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_3.0.0> 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-2026-118426?

octopus server: upgrade to 2026.2.13487, 2026.3.15909. Exact commands for each OS are on this page.

Is CVE-2026-118426 being exploited?

CVE-2026-118426 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-2026-118426 affect?

CVE-2026-118426 affects octopus server. Severity is medium (CVSS 5.3). In affected versions of Octopus Server with the LDAP authentication provider enabled, any authenticated user could call the LDAP user search and LDAP group search.

How urgent is CVE-2026-118426?

Priority 19/100. No elevated risk signals yet.

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References

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