CVE-2026-0704: In affected version of Octopus Deploy it was possible to remove files and/or contents of files on the host usi

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CRITICAL 9.1REMOTEUPGRADE

CVE-2026-0704 is a critical-severity flaw (CVSS 9.1) affecting octopus server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In affected version of Octopus Deploy it was possible to remove files and/or contents of files on the host using an API endpoint. The field lacked validation which could potentially result in ways to circumvent expected workflows.

Why this priority

Critical severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.1 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 68%)
CISA exploited list	No
Weakness	CWE-22
Published	2026-02-25
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

2026-02-25 13:16 UTCPublished CVE record published
2026-06-17 10:11 UTCUpdated Record last modified

octopus octopus server UPGRADE

Affected: >= 2023.1.4189 and < 2025.3.14715

Fixed in: 2025.3.14715

Safe to downgrade to: a release before 2023.1.4189

1. Check installed version

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

2. UPGRADE to 2025.3.14715 (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 2023.1.4189 (Debian / Ubuntu)

apt-cache madison octopus-server sudo apt install octopus-server=<VERSION_BEFORE_2023.1.4189> 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_2023.1.4189> 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-2026-0704?

octopus server: upgrade to 2025.3.14715. Exact commands for each OS are on this page.

Is CVE-2026-0704 being exploited?

CVE-2026-0704 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-2026-0704 affect?

CVE-2026-0704 affects octopus server. Severity is critical (CVSS 9.1). In affected version of Octopus Deploy it was possible to remove files and/or contents of files on the host using an API endpoint. The field lacked validation which could potentially result in ways to circumvent expected workflows.

How urgent is CVE-2026-0704?

Priority 45/100. Critical severity; Remotely exploitable, no login, no user action

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References

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