---
id: CVE-2026-61628
title: nginx ignition is a user interface for the nginx web server
summary: >-
  nginx ignition is a user interface for the nginx web server. Prior to version
  2.41.1, `POST /api/users/onboarding/finish` is registered as anonymous
  (unauthenticated) and creates a user with full ReadWrite admin permissions.
  Because the …
severity: high
cvss: 8.1
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-362
vendor: lucasdillmann
product: nginx-ignition
affected:
  - nginx-ignition < 2.41.1
patched:
  - github.com/lucasdillmann/nginx-ignition 0.0.0-20260621194639-0586b4e55ab
published: '2026-09-21'
updated: '2026-09-23'
sourceUpdated: '2026-09-23T18:25:00.707'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61628'
references:
  - url: >-
      https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183
    label: security-advisories@github.com
  - url: >-
      https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5
    label: security-advisories@github.com
  - url: >-
      https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-61628'
  - url: 'https://github.com/lucasdillmann/nginx-ignition/pull/131'
  - url: 'https://github.com/lucasdillmann/nginx-ignition/releases/tag/2.41.1'
  - url: 'https://github.com/advisories/GHSA-pxcx-fv34-x9p5'
  - url: 'https://github.com/lucasdillmann/nginx-ignition'
tags:
  - nvd
  - exploit-available
  - cve.org
  - ghsa
  - go
  - osv
epss: 0.00357
epssPercentile: 0.29459
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/abraxas/CVE-2026-61628'
  checkedAt: '2026-09-23T18:30:08.220Z'
exploitAvailable: true
aliases:
  - GHSA-pxcx-fv34-x9p5
ecosystem: go
ingestedAt: '2026-09-21T15:19:25.700Z'
---

## Overview

nginx ignition is a user interface for the nginx web server. Prior to version 2.41.1, `POST /api/users/onboarding/finish` is registered as anonymous (unauthenticated) and creates a user with full ReadWrite admin permissions. Because the handler uses a check-then-act (TOCTOU) pattern between the "onboarding already completed?" check and the user-creation write, with no atomic guard, a remote unauthenticated attacker who can reach an instance in its pre-onboarding state can create an administrator account for themselves — and concurrent requests can create multiple admin accounts in a single race. Version 2.41.1 patches the issue.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-61628)

Affected packages:

- `github.com/lucasdillmann/nginx-ignition < 0.0.0-20260621194639-0586b4e55ab`

Patched in:

- `github.com/lucasdillmann/nginx-ignition 0.0.0-20260621194639-0586b4e55ab`

Source: https://github.com/advisories/GHSA-pxcx-fv34-x9p5