CVE-2026-34083

Name: CVE-2026-34083
Creator: NVD / NIST
Published: 2026-04-02T17:16:23.403+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.1/10EPSS 0.11%

Last modified Jun 17, 2026

CVE-2026-34083 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. EPSS estimates a 0.11% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability

0.11%

1.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Signalk	Signal K Server	< 2.24.0

References

https://github.com/SignalK/signalk-server/releases/tag/v2.24.0Product, Release Notes
https://github.com/SignalK/signalk-server/security/advisories/GHSA-cxj8-ggf2-p57cExploit, Vendor Advisory
https://github.com/SignalK/signalk-server/security/advisories/GHSA-cxj8-ggf2-p57cExploit, Vendor Advisory

Timeline

Published: Apr 2, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-34083?

How severe is CVE-2026-34083?

CVE-2026-34083 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.11% probability of exploitation in the next 30 days.

How do I fix CVE-2026-34083?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-34083?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST