SignalK signalk-server up to 2.23.x HTTP Host Header redirect_uri origin validation

Summaryinfo

A vulnerability marked as critical has been reported in SignalK signalk-server up to 2.23.x. This affects the function redirect_uri of the component HTTP Host Header Handler. Performing a manipulation results in origin validation. This vulnerability is cataloged as CVE-2026-34083. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in SignalK signalk-server up to 2.23.x. It has been classified as critical. This affects the function redirect_uri of the component HTTP Host Header Handler. The manipulation with an unknown input leads to a origin validation vulnerability. CWE is classifying the issue as CWE-346. The product does not properly verify that the source of data or communication is valid. 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, SignalK Server contains a code-level vulnerability in its OIDC login and logout handlers where the unvalidated HTTP Host header is used to construct the OAuth2 redirect_uri. Because the redirectUri configuration is silently unset by default, an attacker can spoof the Host header to steal OAuth authorization codes and hijack user sessions in realistic deployments as The OIDC provider will then send the authorization code to whatever domain was injected. This issue has been patched in version 2.24.0.

It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2026-34083 since 03/25/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 2.24.0 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2026-18376). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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/

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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