SignalK signalk-server up to 2.23.x HTTP Endpoint sourcePriorities access control

Summaryinfo

A vulnerability was found in SignalK signalk-server up to 2.23.x. It has been classified as critical. The impacted element is an unknown function of the file /signalk/v1/api/sourcePriorities of the component HTTP Endpoint. Performing a manipulation results in access control. This vulnerability was named CVE-2026-33951. The attack may be initiated remotely. There is no available exploit. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical has been found in SignalK signalk-server up to 2.23.x. This affects an unknown code block of the file /signalk/v1/api/sourcePriorities of the component HTTP Endpoint. The manipulation with an unknown input leads to a access control vulnerability. CWE is classifying the issue as CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.24.0-beta.1, the SignalK Server exposes an unauthenticated HTTP endpoint that allows remote attackers to modify navigation data source priorities. This endpoint, accessible via PUT /signalk/v1/api/sourcePriorities, does not enforce authentication or authorization checks and directly assigns user-controlled input to the server configuration. As a result, attackers can influence which GPS, AIS, or other sensor data sources are trusted by the system. The changes are immediately applied and persisted to disk, allowing the manipulation to survive server restarts. This issue has been patched in version 2.24.0-beta.1.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-33951 since 03/24/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Upgrading to version 2.24.0-beta.1 eliminates this vulnerability.

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Productinfo

Vendor

• SignalK

Name

• signalk-server

Version

• 2.0
• 2.1
• 2.2
• 2.3
• 2.4
• 2.5
• 2.6
• 2.7
• 2.8
• 2.9
• 2.10
• 2.11
• 2.12
• 2.13
• 2.14
• 2.15
• 2.16
• 2.17
• 2.18
• 2.19
• 2.20
• 2.21
• 2.22
• 2.23

Website

• Product: https://github.com/SignalK/signalk-server/

CPE 2.3info

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CPE 2.2info

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Entryinfo

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