CVE-2025-66398NVD

Vulnerability 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.

Severity Level

CRITICAL(9.6)

Published Date

Jan 1, 2026

Last Modified

Oct 1, 2026

Exploitation Status

No confirmed exploitation yet

EPSS Score (30-Day)

19.85%Probability

Root Weakness (CWE)

CWE-78: OS Command Injection ↗

The software constructs all or part of an OS command using externally-influenced input, but does not properly neutralize special elements.

CWE-913: Unknown/Unlisted Weakness ↗

Refer to the official MITRE database for detailed architectural specifications regarding this weakness.

CVSS v3.1 Base Metrics — Score 9.6 (CRITICAL)

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeChanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Affected & Patched Versions

Affected Versions

Signalk Signal K Server < 2.19.0

Patched Versions

Signalk Signal K Server 2.19.0

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