CVE-2025-66398Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)

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.

Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.

Affected products and versions

References and patches

• https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9 ExploitVendor Advisory
• https://github.com/SignalK/signalk-server/releases/tag/v2.19.0 Release Notes