In affected versions of Octopus Server, permissions were not checked correctly resulting in any authenticated user being able to make server level changes using a certain API endpoint despite receiving an error.

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements Present

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Octopus Deploy Octopus Server unaffected
Version Status Constraints
2023.0.0 affected < 2025.4.10523
2025.4.0 affected < 2025.4.10545
2026.1.0 affected < 2026.1.11313

No data.

No data.

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No data.

Project Subscriptions

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://advisories.octopus.com/post/2026/sa2026-04 cve-icon cve-icon
History

Thu, 04 Jun 2026 11:45:00 +0000

Type Values Removed Values Added
Title Authenticated User Can Perform Server‑Level Changes via API in Octopus Server
Weaknesses CWE-285

Thu, 04 Jun 2026 10:00:00 +0000

Type Values Removed Values Added
Description In affected versions of Octopus Server, permissions were not checked correctly resulting in any authenticated user being able to make server level changes using a certain API endpoint despite receiving an error.
References
Metrics cvssV4_0

{'score': 6, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Octopus

Published:

Updated: 2026-06-04T08:49:59.083Z

Reserved: 2026-03-26T07:19:05.417Z

Link: CVE-2026-4881

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-06-04T10:16:39.723

Modified: 2026-06-04T10:16:39.723

Link: CVE-2026-4881

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-06-04T11:30:12Z

Weaknesses