Open Redirect in Signalk Signal K Server
CVE-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 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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.001 (1.6th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: -0.000
Affected products
- Signalk Signal K Server
- Signalk Signalk-Server — versions < 2.24.0
Weakness classification (CWE)
References
- github.com/SignalK/signalk-server/security/advisories/GHSA-cxj8-ggf2-p57c (Exploit, Vendor Advisory)
- github.com/SignalK/signalk-server/releases/tag/v2.24.0 (Product, Release Notes)
Frequently asked questions
- What is CVE-2026-34083?
- CVE-2026-34083 is a medium-severity vulnerability in Signalk Signal K Server, classified under Origin Validation Error. CVSS score: 6.1/10. Published 2026-04-02.
- How severe is CVE-2026-34083?
- Medium severity. CVSS v3 base score is 6.1 out of 10.