CVE-2026-34083
published 2026-04-02CVE-2026-34083: 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…
PriorityP429medium6.1CVSS 3.1
AVNACLPRNUIRSCCLILAN
EPSS
0.11%
1.6th percentile
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
3 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| signalk | signal_k_server | < 2.24.0 | 2.24.0 |
| signalk | signalk-server | < 2.24.0 | 2.24.0 |
| signalk | signalk-server | >= 2.20.0 < 2.24.0 | 2.24.0 |
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GHSA
Signal K Server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
ghsa·2026-04-03
CVE-2026-34083 [MEDIUM] CWE-346 Signal K Server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
Signal K Server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
## Summary
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 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.
_The OIDC specification requires redirect_uri to be pre-registered and not derived from untrusted input. Constructing it from the Host header violates this requirement and introduces a trust boundary break._
This risk is actively amplified
OSV
Signal K Server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
osv·2026-04-03
CVE-2026-34083 [MEDIUM] Signal K Server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
Signal K Server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
## Summary
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 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.
_The OIDC specification requires redirect_uri to be pre-registered and not derived from untrusted input. Constructing it from the Host header violates this requirement and introduces a trust boundary break._
This risk is actively amplified
No detection rules found.
No public exploits indexed.
2026-04-02
Published