---
id: CVE-2026-4881
title: >-
  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.
summary: >-
  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.
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-862
vendor: octopus
product: octopus_server
affected:
  - 'octopus_server >= 2023.1.4189, < 2025.4.10545'
  - 'octopus_server >= 2026.1.675, < 2026.1.11313'
patched:
  - octopus_server 2026.1.11313
published: '2026-06-04'
updated: '2026-06-30'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-4881'
references:
  - url: 'https://advisories.octopus.com/post/2026/sa2026-04'
    label: security@octopus.com
tags:
  - nvd
epss: 0.0021
epssPercentile: 0.11525
ingestedAt: '2026-07-01T09:50:45.939Z'
---

## Overview

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.

## Affected

- `octopus_server >= 2023.1.4189, < 2025.4.10545`
- `octopus_server >= 2026.1.675, < 2026.1.11313`

## Remediation

Upgrade past the affected range:

- `octopus_server 2026.1.11313`