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CVE-2025-66398

CriticalPublished

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

Published: Jan 1, 2026
Updated: Jan 5, 2026
Assigning CNA: GitHub_M
Evidence observed: Aug 8, 2026

Primary CVSS

9.6/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

20.1%

Moderate · next 30 days

Percentile: 97.4%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

cve-2025-66398Exploit
CVE-2025-66398 — Signal K Server ≤ 2.18.0 RCE PoC
cve-2025-66398Exploit
Demonstrate exploitation of Signal K Server CVE-2025-66398 allowing unauthenticated attackers to inject backdoor and enable remote code execution.

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