CVE-2026-61628— nginx ignition has Unauthenticated Admin Account Creation via Onboarding Race Condition
Quick assessment
Affected
lucasdillmann nginx-ignition
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
nginx ignition is a user interface for the nginx web server. Prior to version 2.41.1, 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
Affected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| lucasdillmann | nginx-ignition | < 2.41.1 |
affected |
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I. Basic Information for CVE-2026-61628
Vulnerability Information
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Vulnerability Title
nginx ignition has Unauthenticated Admin Account Creation via Onboarding Race Condition
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| lucasdillmann | nginx-ignition | < 2.41.1 | - |
|
II. Public POCs for CVE-2026-61628
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-61628 (1)
Same Patch Batch · lucasdillmann · 2026-09-21 · 3 CVEs total
| CVE-2026-61629 | 7.5 HIGH | nginx ignition has ParseAcceptLanguage `_` separator bypass that enables ~75x CPU amplifi |
| CVE-2026-61630 | 4.2 MEDIUM | nginx ignition has TOTP Reuse During Validity Window |
IV. Related Vulnerabilities
V. Comments for CVE-2026-61628
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