CVE-2026-33951Network attack vector

Navigation source-priority manipulation via unauthenticated PUT

Published Apr 2, 2026 · Updated Apr 2, 2026

Missing authentication in Signal K Server before 2.24.0-beta.1 allows remote attackers to change navigation source priorities via HTTP PUT. The PUT /signalk/v1/api/sourcePriorities handler in src/serverroutes.ts assigns the request body to sourcePriorities without authentication or validation, activates it, and writes it to disk. Network access to the server is sufficient to persist changes across restarts and control which active GPS, AIS, or sensor source supplies navigation data.

CVSS severity6.9
Medium
EPSS probability0.31%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authentication in Signal K Server before 2.24.0-beta.1 allows remote attackers to change navigation source priorities via HTTP PUT. The PUT /signalk/v1/api/sourcePriorities handler in src/serverroutes.ts assigns the request body to sourcePriorities without authentication or validation, activates it, and writes it to disk. Network access to the server is sufficient to persist changes across restarts and control which active GPS, AIS, or sensor source supplies navigation data.

The record

CVE
CVE-2026-33951
Published
Apr 2, 2026
Updated
Apr 2, 2026
Vendor
Signal K
Product
Signal K Server
Classifications
CWE-306, CWE-284, T1565.002
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.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Signal K · Signal K Serverversion=< 2.24.0-beta.1

Published CVSS scores

6.9GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.

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

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 exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
CWE-284Improper Access Control
T1565.002Transmitted Data Manipulation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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