CVE-2025-66398

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.

• CWE-78
• CWE-913

• https://github.com/SignalK/signalk-server/releases/tag/v2.19.0Release Notes
• https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9Exploit, Vendor Advisory

Published

Jan 1, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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