CVE-2026-33950Public exploitNetwork attack vector

Unauthenticated administrator access via persistent setup route

Published Apr 2, 2026 · Updated Apr 2, 2026

Improper authorization in Signal K Server before 2.24.0-beta.4 allows remote attackers to create administrator accounts without authentication. The /skServer/enableSecurity route remains registered after initial setup, passes the entire request body to addUser(), and tokensecurity.ts trusts its type field. Network access to the HTTP service is sufficient; an injected administrator can alter vessel routing data and server configuration and access restricted endpoints.

CVSS severity9.4
Critical
EPSS probability0.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper authorization in Signal K Server before 2.24.0-beta.4 allows remote attackers to create administrator accounts without authentication. The /skServer/enableSecurity route remains registered after initial setup, passes the entire request body to addUser(), and tokensecurity.ts trusts its type field. Network access to the HTTP service is sufficient; an injected administrator can alter vessel routing data and server configuration and access restricted endpoints.

The record

CVE
CVE-2026-33950
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Signal K
Product
Signal K Server
Classifications
CWE-285, CWE-288, CWE-862, T1098
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 2, 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=< 2.24.0-beta.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Signal K · Signal K Serverversion=< 2.24.0-beta.4

Published CVSS scores

9.4GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-285Improper Authorization
CWE-288Authentication Bypass Using an Alternate Path or Channel
CWE-862Missing Authorization
T1098Account Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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