CVE-2026-34083
CVE-2026-34083 · signalk-server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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.
CVSS 6.1 · Medium · EPSS 0.1% · Fix available
- Published
- Updated
Stack: node
Affected products and versions
signalk-server
- Versions
- < 2.24.0: Affected
No fix published
signalk-server npm
- Affected ranges
- SEMVER: ≥ 2.20.0, < 2.24.0
Update to 2.24.0