CVE-2026-34083: Signalk Signal K Server

Medium severity, CVSS 6.1. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Signalk Signal K Server: before 2.24.0 (fixed in 2.24.0)

Published 2026-04-02. Last modified 2026-07-24.