CVE-2026-61628: nginx ignition has Unauthenticated Admin Account Creation via Onboarding Race Condition
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.
References
- github.com/advisories/GHSA-pxcx-fv34-x9p5
- github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183
- github.com/lucasdillmann/nginx-ignition/pull/131
- github.com/lucasdillmann/nginx-ignition/releases/tag/2.41.1
- github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5
- nvd.nist.gov/vuln/detail/CVE-2026-61628
Code Behaviors & Features
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