CVE-2025-66398

PUBLISHED

1/1/2026 a0819718-46f1-4df5-94e2-005712e83aaa

Technical 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.

Affected Products

SignalK

signalk-server

< 2.19.0

References

https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9

https://github.com/SignalK/signalk-server/releases/tag/v2.19.0

9.7 CVSS v3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

Impact Analysis

Attack Vector Network

Attack Complexity Low

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