CVE-2025-66398

Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)

State: Published
Severity: 9.7 Critical
Published: Jan 1, 2026
Updated: Jan 5, 2026
Reserved: Nov 28, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	9.7 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H	GitHub_M

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CWE-913 Improper Control of Dynamically-Managed Code Resources

Affected Products

Product	Versions
signalk-serverSignalK	< 2.19.0Affected

References

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