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Public proof of conceptFix available

CVE-2025-66398

A public proof of concept exists; no exploitation attested.

  • Published2026-01-01
  • Fixed in2.19.0
  • WeaknessCWE-78 · CWE-913

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2026-01-0118:15CVE publishedNVD

Versions per branch

NVD · OSV
Signalk signal k server
BranchAffectedFixed in
2.19< 2.19.02.19.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As GitHub_M, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • signalk-server
    Affected
    • = < 2.19.0no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-01-01

Fix

  1. Update Signalk signal k server to 2.19.0

Advisories and patches

Detection

read 2026-11-01 01:02 UTC
Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2026-01-05
  • CNACVSS 3.19.6known since 2026-10-23
  • NVDCVSS 3.18.8read 2026-10-23
  • CNAweakness (CWE)CWE-78, CWE-913known since 2026-10-23
  • FIRST EPSSEPSS score19.9 %read 2026-11-09
  • PoC-in-GitHubproof of concept2known since 2026-11-01
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryCRITICAL2026-01-02

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Published
2026-01-01
Last Modified
2026-10-07
NVD status
Analyzed
GitHub Advisory
GHSA-w3x5-7c4c-66p9

Frequently asked questions

What is CVE-2025-66398?

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.

Is CVE-2025-66398 actively exploited?

A proof-of-concept exploit exists for CVE-2025-66398, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2025-66398?

CVE-2025-66398 has a CVSS v3 base score of 8.8 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

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