CVE-2026-34083: medium-severity vulnerability in signalk-server
signalk-server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
Published
13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.1epss 0.1%
exploitation probability
0.1%top 99% of all CVEs
observed exploitation
nono source reports it
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:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Affected products
SignalK · signalk-serverRelated CVEs — signalk-server
In the same product, most dangerous first.
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