Security Advisory 2026-01
| Summary | File Modification/Deletion Path Traversal |
| Advisory Number | 2026-01 |
| Discovery Date | 06 Jan 2026 |
| Patch Release Date | 23 Jan 2026 |
| Advisory Release Date | 25 Feb 2026 |
| Product | Octopus Server |
| Operating System | Windows and Linux |
| Severity | Medium |
| CVE ID | CVE-2026-0704 |
Customers who have downloaded and installed any of the Octopus Server versions listed below ("Details") are affected.
Please upgrade your Octopus Server immediately to fix this vulnerability.
Customers who have upgraded Octopus Server to version 2025.4.10446 or higher are not affected.
Severity
Octopus Deploy has given this vulnerability a medium rating. This rating was given according to the Octopus Deploy severity levels, which ranks vulnerabilities as critical, high, medium, or low severity.
This is our assessment and you should evaluate its applicability to your own environment.
Details
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.
The versions of Octopus Server affected by this vulnerability are:
- All 2023.x versions
- All 2024.x versions
- All 2025.1.x, 2025.2.x versions
- All 2025.3.x versions before 2025.3.14715
Fix
To address this vulnerability, we have released Octopus Server version:
- 2025.3.14715
- 2025.4.10359
The latest versions of Octopus Deploy products can be downloaded from https://octopus.com/downloads and previous versions can be downloaded from https://octopus.com/downloads/previous
What You Need to Do
Octopus Deploy recommends that you upgrade to the latest version (2025.4.10446). You can download the latest version of Octopus Server from https://octopus.com/downloads
If you can't upgrade to the latest version (2025.4.10446):
| If you have feature version... | ...then upgrade to this version |
|---|---|
| 2023.x , 2024.x | 2025.3.14715 or greater |
| 2025.1.x, 2025.2.x, 2025.3.x | 2025.3.14715 or greater |
| 2025.4.x | 2025.4.10359 or greater |
Mitigation
There is no known mitigation for CVE-2026-0704, it is important to upgrade to a fixed version as soon as possible.
Support
If you have any questions or concerns regarding this advisory, please contact our support team https://octopus.com/support.
Exploitation and Public Announcements
The Octopus Deploy security team is not aware of any public announcements or malicious use of the vulnerability that is described in this advisory.
Source
This vulnerability was found by Bugcrowd Researcher: oub3ll4