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.
Published: 2026-01-01
Score: 9.7 Critical
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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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)
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'}


Subscriptions

Signalk Signal K Server Signalk-server
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