PT-2026-29798 · Unknown · Signal K Server

Vashuvats · Published 2026-04-02 · Updated 2026-04-03 · CVE-2026-34083

Positive Technologies (AI Summary)

CVSS v3.1

6.1

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: SignalK Server versions prior to 2.24.0

Description: SignalK Server contains a code-level issue 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. The OIDC provider will then send the authorization code to the injected domain. The vulnerability is amplified by the official documentation recommending an Nginx configuration that forwards the vulnerable Host header. The issue affects the login handler in 'oidc-auth.ts' (lines 278-282) and the logout handler in 'oidc-auth.ts' (lines 513-515), both utilizing the attacker-controlled host header to construct redirect URIs.

Recommendations: Update to SignalK Server version 2.24.0 or later.

Exploit

Fix

Origin Validation Error

Open Redirect

Weakness Enumeration

CWE-346

CWE-601

Related Identifiers

CVE-2026-34083

GHSA-CXJ8-GGF2-P57C

Affected Products

Signal K Server

References · 5

• 🔥 https://github.com/SignalK/signalk-server/security/advisories/GHSA-cxj8-ggf2-p57c · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-34083 · Security Note
• https://osv.dev/vulnerability/GHSA-cxj8-ggf2-p57c · Vendor Advisory
• https://github.com/SignalK/signalk-server · Note
• https://github.com/SignalK/signalk-server/releases/tag/v2.24.0 · Note