Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.19.0, an unauthenticated attacker can pollute the internal state (`restoreFilePath`) of the server via the `/skServer/validateBackup` endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., `security.json`, `package.json`), leading to account takeover and Remote Code Execution (RCE). Version 2.19.0 patches this vulnerability.
Advisories
Source ID Title
Github GHSA Github GHSA GHSA-w3x5-7c4c-66p9 Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Tue, 06 Jan 2026 18:45:00 +0000

Type Values Removed Values Added
First Time appeared Signalk signal K Server
CPEs cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*
Vendors & Products Signalk signal K Server

Tue, 06 Jan 2026 00:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 05 Jan 2026 10:45:00 +0000

Type Values Removed Values Added
First Time appeared Signalk
Signalk signalk-server
Vendors & Products Signalk
Signalk signalk-server

Thu, 01 Jan 2026 18:15:00 +0000

Type Values Removed Values Added
Description Signal K Server is a server application that runs on a central hub in a boat. Prior to version 2.19.0, an unauthenticated attacker can pollute the internal state (`restoreFilePath`) of the server via the `/skServer/validateBackup` endpoint. This allows the attacker to hijack the administrator's "Restore" functionality to overwrite critical server configuration files (e.g., `security.json`, `package.json`), leading to account takeover and Remote Code Execution (RCE). Version 2.19.0 patches this vulnerability.
Title Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)
Weaknesses CWE-78
CWE-913
References
Metrics cvssV3_1

{'score': 9.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-01-05T21:00:41.972Z

Reserved: 2025-11-28T23:33:56.363Z

Link: CVE-2025-66398

cve-icon Vulnrichment

Updated: 2026-01-05T21:00:37.636Z

cve-icon NVD

Status : Analyzed

Published: 2026-01-01T18:15:40.550

Modified: 2026-01-06T18:34:31.007

Link: CVE-2025-66398

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-01-05T10:14:48Z

Weaknesses