high8.1
CVE-2026-61628
nginx ignition has Unauthenticated Admin Account Creation via Onboarding Race Condition
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/lucasdillmann/nginx-ignition | < 0.0.0-20260621194639-0586b4e55ab | 0.0.0-20260621194639-0586b4e55ab |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-pxcx-fv34-x9p5
- https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5
- https://nvd.nist.gov/vuln/detail/CVE-2026-61628
- https://github.com/lucasdillmann/nginx-ignition/pull/131
- https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183
- https://github.com/lucasdillmann/nginx-ignition/releases/tag/2.41.1