Vulnerability 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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a25
- https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv
- https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv
FAQ
What is CVE-2026-61628?
CVE-2026-61628 is a vulnerability with a CVSS score of 8.1 (HIGH). 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 Read...
How severe is CVE-2026-61628?
CVE-2026-61628 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-61628?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.