CVE-2026-4881: Insufficient permission checks on an API endpoint in Octopus Deploy Octopus Server
CVE-2026-4881 is a vulnerability in Octopus Deploy Octopus Server where insufficient permission checks on a specific API endpoint allow any authenticated user to make server-level changes despite receiving an error. This affects multiple versions of Octopus Server and has a medium severity rating with a CVSS score of 6. No official patch or remediation guidance is currently provided by the vendor.
AI Analysis
Technical Summary
The vulnerability CVE-2026-4881 in Octopus Deploy Octopus Server involves improper permission validation on an API endpoint. Authenticated users with limited privileges can perform server-level modifications due to the failure of the system to correctly enforce permission checks, even though an error is returned. This issue affects versions 2023.0.0, 2025.4.0, and 2026.1.0 of Octopus Server. The CVSS 4.0 vector indicates network attack vector, low attack complexity, partial privileges required, no user interaction, and high impact on authorization. No vendor advisory or patch information is currently available.
Potential Impact
Any authenticated user can bypass intended permission restrictions and make unauthorized server-level changes via the vulnerable API endpoint. This could lead to unauthorized configuration changes or other administrative actions, potentially compromising the integrity and security of the Octopus Server environment. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the Octopus Server API endpoints to trusted users only and monitor for unusual activity related to server-level changes. Avoid granting unnecessary authentication privileges to users.
CVE-2026-4881: Insufficient permission checks on an API endpoint in Octopus Deploy Octopus Server
Description
CVE-2026-4881 is a vulnerability in Octopus Deploy Octopus Server where insufficient permission checks on a specific API endpoint allow any authenticated user to make server-level changes despite receiving an error. This affects multiple versions of Octopus Server and has a medium severity rating with a CVSS score of 6. No official patch or remediation guidance is currently provided by the vendor.
CVSS v4.0
Score 6.0medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability CVE-2026-4881 in Octopus Deploy Octopus Server involves improper permission validation on an API endpoint. Authenticated users with limited privileges can perform server-level modifications due to the failure of the system to correctly enforce permission checks, even though an error is returned. This issue affects versions 2023.0.0, 2025.4.0, and 2026.1.0 of Octopus Server. The CVSS 4.0 vector indicates network attack vector, low attack complexity, partial privileges required, no user interaction, and high impact on authorization. No vendor advisory or patch information is currently available.
Potential Impact
Any authenticated user can bypass intended permission restrictions and make unauthorized server-level changes via the vulnerable API endpoint. This could lead to unauthorized configuration changes or other administrative actions, potentially compromising the integrity and security of the Octopus Server environment. There are no known exploits in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict access to the Octopus Server API endpoints to trusted users only and monitor for unusual activity related to server-level changes. Avoid granting unnecessary authentication privileges to users.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- Octopus
- Date Reserved
- 2026-03-26T07:19:05.417Z
- Cvss Version
- 4.0
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a214d96e29bf47b50923256
Added to database: 06/04/2026, 10:04:06 UTC
Last enriched: 06/30/2026, 23:41:47 UTC
Last updated: 07/31/2026, 19:22:59 UTC
Views: 54
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