CVE-2025-66398
Critical
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.
SeverityCritical
CVSS9.6
Exploit probability—
ProductSignalk Signal K Server
PublishedJan 1, 2026
First seenJan 1, 2026
Weakness typeCWE-78OS command injectionCWE-913CWE-913
How to fix
Update
- signalk signal_k_server2.19.0 or later
- signalk-server2.19.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| signalk signal_k_server | v < 2.19.0 | 2.19.0 |
| signalk-servernpm | v < 2.19.0 | 2.19.0 |
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