Severity by source
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Remote unauthenticated (AV:N/PR:N/UI:N) but gated on the transient pre-onboarding state and a race (AC:H); admin account grants full C/I/A over the app (S:U).
Primary rating from Vendor (GitHub_M).
CVSS VectorVendor: GitHub_M
Lifecycle Timeline
6DescriptionCVE.org
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.
Articles & Coverage 1
AnalysisAI
Unauthenticated administrator account creation in nginx-ignition affects deployments running versions prior to 2.41.1 that are still in their pre-onboarding state. The endpoint POST /api/users/onboarding/finish is registered as anonymous and, because its "onboarding already completed?" check is not atomic with the subsequent user write, a remote unauthenticated attacker (CVSS 3.1 vector: AV:N/AC:H/PR:N/UI:N, base 8.1) who can reach such an instance can create a full ReadWrite administrator account for themselves, and concurrent requests can create multiple admin accounts in a single race. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the nginx-ignition instance to be network-reachable while still in its pre-onboarding state - i.e. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a genuine high-priority flaw when the precondition is met, but the precondition sharply narrows the realistic window. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Vendor-released patch: upgrade to nginx-ignition 2.41.1 or later (see the release notes embedded in the fixing commit at https://github.com/lucasdillmann/nginx-ignition/commit/0586b4e55ab780676d3553a2592979dfa2fb0183 and the advisory at https://github.com/lucasdillmann/nginx-ignition/security/advisories/GHSA-pxcx-fv34-x9p5). … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, inventory all nginx-ignition deployments to identify instances running versions prior to 2.41.1 that are in a pre-onboarding state and network-reachable; immediately restrict network access to the POST /api/users/onboarding/finish endpoint or complete onboarding for those instances to close the window. …
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Same weakness CWE-362 – Race Condition
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External POC / Exploit Code
Leaving vuln.today
EUVD-2026-83947
GHSA-pxcx-fv34-x9p5