CVE-2026-4881

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-04 · updated 2026-07-22
Weakness: CWE-862

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.

Affected products

Octopus Deploy Octopus Server: from 2023.1.4189 before 2025.4.10545; from 2026.1.675 before 2026.1.11313 — fixed in 2025.4.10545, 2026.1.11313

How to fix

Upgrade to a fixed version: Octopus Deploy Octopus Server 2025.4.10545, 2026.1.11313. Check the vendor advisory for mitigations.

References

https://advisories.octopus.com/post/2026/sa2026-04

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