CVE-2026-34083
MediumCVSS 6.1Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
Signal K Server before version 2.24.0 has a vulnerability in OIDC login/logout handlers where the unvalidated Host header is used to construct the OAuth2 redirect_uri. Since redirectUri is unset by default, an attacker can spoof the Host header to steal OAuth authorization codes and hijack user sessions.
Risk Assessment
An attacker can hijack user sessions by stealing OAuth authorization codes, leading to unauthorized access to platform data and functionality.
Recommendation
Update Signal K Server to version 2.24.0 or later, which includes a fix for Host header validation.
Original NVD description (English source)
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.