CVE-2026-61628Public exploitNetwork attack vectorHinoki check available

Unauthenticated administrator creation via onboarding race

Published Sep 21, 2026 · Updated Sep 21, 2026

Race condition in nginx ignition before 2.41.1 allows remote attackers to create administrator accounts through the onboarding endpoint. The handler checks onboarding state and then saves a full ReadWrite user without a lock, transaction, or unique constraint. An instance must be reachable while onboarding is incomplete; a successful race returns administrator JWTs and permits persistent control of the managed nginx configuration.

CVSS severity8.1
High
EPSS probability0.43%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Race condition in nginx ignition before 2.41.1 allows remote attackers to create administrator accounts through the onboarding endpoint. The handler checks onboarding state and then saves a full ReadWrite user without a lock, transaction, or unique constraint. An instance must be reachable while onboarding is incomplete; a successful race returns administrator JWTs and permits persistent control of the managed nginx configuration.

The record

CVE
CVE-2026-61628
Published
Sep 21, 2026
Updated
Sep 21, 2026
Vendor
Lucas Dillmann
Product
nginx ignition
Classifications
CWE-362, T1136.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 2.41.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Lucas Dillmann · nginx ignitionversion=< 2.41.1

Published CVSS scores

8.1GitHubCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1136.001Create Account: Local Account

Public exploit references

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Technologies

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