Security Advisory 2022-04

Summary User invitation limit in Octopus Server can be exceeded (CVE-2022-1670)
Advisory Number 2022-04
Discovery Date 21 Jul 2021
Patch Release Date 24 March 2022
Advisory Release Date 19 May 2022
Product Octopus Server
Operating System Linux and Microsoft Windows
Severity Low
CVE ID CVE-2022-1670

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 2022.1.2584 or higher are not affected.


Octopus Deploy has given this vulnerability a Low 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.


When generating a user invitation code, the validity of this code can be set for a specific number of users. It was possible to bypass this restriction of validity to create extra user accounts above the initial number of invited users.

The versions of Octopus Server affected by this vulnerability are:

  • All 0.x.x, 1.x.x, 2.x.x, 3.x.x, 4.x.x versions
  • All 2018.x.x, 2019.x.x, 2020.x.x versions
  • All 2021.1.x, 2021.2.x versions
  • All 2021.3.x versions before 2021.3.12533
  • All 2022.1.x versions before 2022.1.53


To address this vulnerability, we have released Octopus Server version:

  • 2022.1.53
  • 2021.3.12533

The latest versions of Octopus Deploy products can be downloaded from and previous versions can be downloaded from

What You Need to Do

Octopus Deploy recommends that you upgrade to the latest version (2022.1.2584). You can download the latest version of Octopus Server from


There is no known mitigation for CVE-2022-1670, it is important to upgrade to a fixed version as soon as possible.


If you have any questions or concerns regarding this advisory, please contact our support team

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.


This vulnerability was identified by Beyond Binary