CVE-2026-61628

8.1 HIGHpublic exploit available

Published 2026-09-21 · Updated 2026-09-21

AI risk analysis

Summary: The flaw allows unauthenticated attackers to create a full admin account by exploiting a race condition in the onboarding process.
Exploitability: Exploitation requires reaching an instance in its pre-onboarding state and making concurrent POST requests, which is moderately difficult.
Blast radius: If exploited, this could grant full administrative control to attackers, leading to severe data breaches or system compromise.
Prioritized remediation: Update to nginx ignition version 2.41.1 or later to patch the vulnerability.

auth-bypasswebrace-conditionadmin-rights

Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.

NVD 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 vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Weaknesses

CWE-362

Public exploit & PoC references

All references

Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.

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