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

Type: advisorySources: OSV

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.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2025-66398
Confirmed fixed CVEs
Not specified
Updated in this feed
3 Nov 2026, 17:59 UTC · Revision 1

Source evidence

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

core-osv · Original source

Published 1 Jan 2026, 18:00 UTC

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.

osv:CVE-2025-66398
Complete source record
{
  "id": "c96b14c4da580bfc5eb2a6961658776912b013fd224733c22d52aa627d3a0f55",
  "url": "https://osv.dev/vulnerability/CVE-2025-66398",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Signal K Server has Unauthenticated State Pollution leading to Remote Code Execution (RCE)",
    "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.",
    "evidence": "osv:CVE-2025-66398",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2025-66398",
      "aliases": [
        "CVE-2025-66398",
        "GHSA-w3x5-7c4c-66p9"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/signalk/signalk-server",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "3037c517bb8de70c4b74b61192c57d6176731571"
                }
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              "database_specific": {
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                      {
                        "introduced": "0"
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                      {
                        "fixed": "2.19.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3037c517bb8de70c4b74b61192c57d6176731571"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.19.0"
                  },
                  {
                    "cpe": "cpe:2.3:a:signalk:signal_k_server:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "0"
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                      {
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                    "source": "CPE_RANGE"
                  }
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          "versions": [
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          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66398.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:31.240318807Z",
      "provider": "osv",
      "references": [
        "https://github.com/SignalK/signalk-server/releases/tag/v2.19.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66398.json",
        "https://github.com/SignalK/signalk-server/security/advisories/GHSA-w3x5-7c4c-66p9",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-66398"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-78",
          "CWE-913"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66398.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-66398",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 498070,
  "published_at": "2026-01-01T18:00:38.575+00:00"
}