---
id: "CVE-2026-124627"
page: "https://infrastack.ai/live/CVE-2026-124627"
kind: "vulnerability"
aliases: ["CVE-2026-124627"]
title: "Octopus Server: new users can inherit another user's LDAP team permissions"
severity: "high"
cvss: 8.7
epss: null
exploited: false
status: "open"
category: "other"
products: [{"name": "Octopus Server", "fixed": ["2026.2.13526", "2026.3.15926"], "affected": "all 3.x, 4.x, 2018.x-2025.x, 2026.1.x; 2026.2.x < 2026.2.13526; 2026.3.x < 2026.3.15926", "ecosystem": "vendor"}]
ecosystems: []
tags: ["authorization", "ldap", "octopus-server", "other", "self-hosted"]
not_affected_if: ["no-ldap-auth", "no-ldap-team-mapping", "octopus-cloud", "patched-version"]
published_at: "2026-11-12T14:17:28+00:00"
first_seen_at: "2026-11-12T14:38:37+00:00"
updated_at: "2026-11-12T14:40:01+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-124627", "first_seen_at": "2026-11-12T14:38:37+00:00"}, {"source": "analyst", "url": "https://advisories.octopus.com/post/2026/sa2026-23/", "first_seen_at": "2026-11-12T14:40:01+00:00", "cites": ["https://advisories.octopus.com/post/2026/sa2026-23/"]}]
exploit_sources: []
---

# Octopus Server: new users can inherit another user's LDAP team permissions

Link for people: https://infrastack.ai/live/CVE-2026-124627 (this .md is for agents)

Octopus Server does not check the external identity linked to a newly registered user, so that user can receive the LDAP-mapped team memberships and permissions of a different user. The flaw only applies when LDAP authentication is enabled and LDAP groups are mapped to Octopus teams.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- vendor:Octopus Server affected all 3.x, 4.x, 2018.x-2025.x, 2026.1.x; 2026.2.x < 2026.2.13526; 2026.3.x < 2026.3.15926 fixed 2026.2.13526, 2026.3.15926

## How to check

1. Octopus Server version (Configuration > Diagnostics, or the footer): affected if it is any 3.x/4.x/2018-2025/2026.1.x, 2026.2.x before 2026.2.13526, or 2026.3.x before 2026.3.15926.
2. Only exposed if LDAP authentication is enabled (Configuration > Settings > Authentication > LDAP) AND LDAP groups are mapped to Octopus teams (Configuration > Teams > external groups/roles).

## Fix

Upgrade Octopus Server to 2026.2.13526 or later on the 2026.2 line, or 2026.3.15926 or later on 2026.3 (latest 2026.3.16117). All 3.x, 4.x, 2018-2025 and 2026.1.x must move to 2026.2.13526 or newer. Octopus Cloud is already patched.

## Timeline

- 2026-11-12T14:38:37+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-124627
- 2026-11-12T14:40:01+00:00 analyst https://advisories.octopus.com/post/2026/sa2026-23/ — Read vendor advisory 2026-23 (Octopus). Affected/fixed versions and no-mitigation statement from vendor page; no exploitation known per vendor; not checked social.

## Documents

- [advisory] Octopus Security Advisory 2026-23: LDAP identity injection during invitation https://advisories.octopus.com/post/2026/sa2026-23/

## From the sources

In affected versions of Octopus Server, incorrect validation of the external identity linked to a newly registered user could result in that user receiving the LDAP-mapped team memberships and associated permissions of another user. This issue only affects instances with LDAP authentication enabled and LDAP groups mapped to Octopus teams.

---

_Free to read, with fair use of about 60 pages a minute. For higher limits or API access: sales@infrastack.ai_