Skip to main content

nginx-ignition EUVDEUVD-2026-83947

| CVE-2026-61628 HIGH
Race Condition (CWE-362)
2026-09-21 GitHub_M GHSA-pxcx-fv34-x9p5
8.1
CVSS 3.1 · Vendor: GitHub_M
Share

Severity by source

Vendor (GitHub_M) PRIMARY
8.1 HIGH
AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.1 HIGH

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).

3.1 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (GitHub_M).

CVSS VectorVendor: GitHub_M

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

6
Patch available
Sep 21, 2026 - 16:16 EUVD
Metadata Corrected
Sep 21, 2026 - 15:40 vuln.today
tag: Go added
Metadata Corrected
Sep 21, 2026 - 15:40 vuln.today
tag: Information Disclosure removed
POC Analysis Generated
Sep 21, 2026 - 15:20 vuln.today
Analysis Generated
Sep 21, 2026 - 15:16 vuln.today
CVE Published
Sep 21, 2026 - 14:44 cve.org
HIGH 8.1

DescriptionCVE.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.

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. …

Unlock full vulnerability intelligence

  • Risk assessment & exploitation conditions
  • Attack chain visualization
  • Remediation with exact patch versions
  • Threat intelligence from 22 sources
  • Personal watchlist & email alerts

Free forever · No credit card required

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
technique details hidden
Delivery
technique details hidden
Exploit
technique details hidden
Execution
technique details hidden
Impact
technique details hidden

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. …

Sign in for detailed remediation steps and compensating controls.

Threat intelligence, references, and detailed analysis are available after sign-in.

More in Go

View all
CVE-2023-44487 HIGH POC
7.5 Oct 10

Denial of service against HTTP/2 server implementations allows remote unauthenticated attackers to exhaust server resour

CVE-2016-5386 HIGH
8.1 Jul 19

The net/http package in Go through 1.6 does not attempt to address RFC 3875 section 4.1.18 namespace conflicts and there

CVE-2025-68121 CRITICAL POC
10.0 Feb 05

Critical certificate validation bypass in Go crypto/tls during session resumption. If ClientCAs or RootCAs fields are mu

CVE-2019-14809 CRITICAL POC
9.8 Aug 13

net/url in Go before 1.11.13 and 1.12.x before 1.12.8 mishandles malformed hosts in URLs, leading to an authorization by

CVE-2026-90942 CRITICAL POC
9.3 Sep 14

Casdoor through 4.4.0 exposes its instance-wide built-in JWT signing private key unmasked through the /api/get-certs and

CVE-2026-92791 HIGH POC
8.7 Sep 16

Unauthenticated path traversal in Uber Kraken through 0.1.29 allows remote attackers to read files outside the configure

CVE-2018-7187 HIGH POC
8.8 Feb 16

The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used, does not validate the import pa

CVE-2026-16651 HIGH POC
8.7 Sep 21

Denial of service in Temporal Server allows an authenticated caller holding at least namespace read permission to crash

CVE-2026-82405 HIGH POC
8.7 Sep 23

Account takeover in Klever-Go's KleverUpdateAccountPermission built-in (all versions prior to 1.7.20) allows an attacker

CVE-2026-82409 HIGH POC
8.4 Sep 23

Maliciously crafted on-chain account names processed by Klever-Go prior to 1.7.20 are spliced into Elasticsearch _bulk r

CVE-2026-55062 HIGH POC
8.4 Aug 17

Path traversal in the uniget CLI (Go module gitlab.com/uniget-org/cli) before version 0.27.6 lets a local user read and

CVE-2026-63199 HIGH POC
8.3 Sep 18

Cross-scope secret disclosure in Perses (versions 0.43.0 through 0.54.0-rc.0) allows an authenticated user holding only

Share

EUVD-2026-83947 vulnerability details – vuln.today

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy