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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-66398
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-01-01 18:15:40 UTC
Updated2026-10-01 08:10:00 UTC
DescriptionSignal 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.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.198500000 probability, percentile 0.973480000 (date 2026-10-04)

Problem Types: CWE-78 | CWE-913 | CWE-78 CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') | CWE-913 CWE-913: Improper Control of Dynamically-Managed Code Resources

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary8.8HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1[email protected]Secondary9.6CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED9.7CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Signalk Signal K Server All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA SignalK Signalk-server affected < 2.19.0 Not specified

References

ReferenceSourceLinkTags
github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9 [email protected] github.com Exploit, Vendor Advisory
github.com/SignalK/signalk-server/releases/tag/v2.19.0 [email protected] github.com Release Notes
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