EUVD-2026-18376
GHSA-cxj8-ggf2-p57c
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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4Tags
Description
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.
Analysis
SignalK Server versions prior to 2.24.0 allow unauthenticated attackers to hijack OAuth2 sessions and steal authorization codes by spoofing the HTTP Host header in OIDC login and logout handlers. The vulnerability exploits the default-unset redirectUri configuration, causing the OIDC provider to send authorization codes to an attacker-controlled domain. …
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