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CVE-2026-34083— signalk-server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow

Quick assessment

Affected
SignalK signalk-server
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Signal K Server是Signal K开源的一个船用中央服务器。 Signal K Server 2.24.0之前版本存在安全漏洞，该漏洞源于未验证的Host标头用于构造重定向URI，可能导致OAuth授权码窃取和会话劫持。

CVSS 6.1 · Medium EPSS 0.11% · P2
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I. Basic Information for CVE-2026-34083

Vulnerability Information
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Vulnerability Title
signalk-server: OAuth Authorization Code Theft via Unvalidated Host Header in OIDC Flow
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
源验证错误
Source: CVE Program / CVE List V5
Vulnerability Title
Signal K Server 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Signal K Server是Signal K开源的一个船用中央服务器。 Signal K Server 2.24.0之前版本存在安全漏洞，该漏洞源于未验证的Host标头用于构造重定向URI，可能导致OAuth授权码窃取和会话劫持。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
SignalK signalk-server < 2.24.0 -

II. Public POCs for CVE-2026-34083

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III. Intelligence Information for CVE-2026-34083

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Vendor Advisories for CVE-2026-34083 (1)

Same Patch Batch · SignalK · 2026-04-02 · 4 CVEs total

CVE-2026-33950 9.4 CRITICAL signalk-server: Privilege Escalation by Admin Role Injection via /enableSecurity
CVE-2026-35038 signalk-server: Arbitrary Prototype Read via `from` Field Bypass
CVE-2026-33951 signalk-server: Unauthenticated Source Priorities Manipulation

IV. Related Vulnerabilities

Same product: signalk-server
Same vendor: SignalK
Same weakness: CWE-346

V. Comments for CVE-2026-34083

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