CVE-2026-61628
Description
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.
How to fix
- github.com/lucasdillmann/nginx-ignition0.0.0-20260621194639-0586b4e55ab or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github.com/lucasdillmann/nginx-ignitionGo | v < 0.0.0-20260621194639-0586b4e55ab, No range specified | 0.0.0-20260621194639-0586b4e55ab |
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