MagicMirror socket payload secret placeholder expansion can disclose SECRET_* environment variables

{
  "id": "e61bc45afc70b7e9dec98d3234a8a0244f9f44242583b016899fdf98c86aa2a9",
  "url": "https://osv.dev/vulnerability/CVE-2026-63640",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "MagicMirror socket payload secret placeholder expansion can disclose SECRET_* environment variables",
    "summary": "MagicMirror² is an open source modular smart mirror platform. Prior to 2.37.0, when hideConfigSecrets is enabled, the catch-all socket dispatcher in js/node_helper.js passes every inbound object payload through replaceSecretPlaceholder in js/server_functions.js before invoking socketNotificationReceived. A client connected to a loaded module namespace can submit a SECRET_API_KEY placeholder, causing the server to replace it with the corresponding process environment value. The default weather helper accepts INIT_WEATHER, copies the attacker-controlled instanceId, and returns it in WEATHER_ERROR, providing an echo path for the expanded secret. This reverses the intended one-way redaction boundary and can disclose API tokens, credentials, or service keys stored in SECRET_ variables. This issue is fixed in version 2.37.0.",
    "evidence": "osv:CVE-2026-63640",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-63640",
      "aliases": [
        "CVE-2026-63640",
        "GHSA-q4gh-4ffp-5cg8"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/magicmirrororg/magicmirror",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "4b4a59534f7da01e4030e46029fe9dd649a7675e"
                },
                {
                  "fixed": "ca7b752025962441196e148f8c1bc04b90117979"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2.37.0"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "ca7b752025962441196e148f8c1bc04b90117979"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "4b4a59534f7da01e4030e46029fe9dd649a7675e"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "v2.37.0"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.36.0",
            "v2.35.0",
            "v2.34.0",
            "v2.33.0",
            "v2.32.0",
            "v2.31.0",
            "v2.30.0",
            "v2.29.0",
            "v2.28.0",
            "v2.27.0",
            "v2.26.0",
            "v2.25.0",
            "v2.24.0",
            "v2.23.0",
            "v2.22.0",
            "v2.21.0",
            "v2.20.0",
            "v2.19.0",
            "v2.18.0",
            "v2.17.1",
            "v2.17.0",
            "v2.16.0",
            "v2.15.0",
            "v2.14.0",
            "v2.13.0",
            "v2.12.0",
            "v2.11.0",
            "v2.10.1",
            "v2.10.0",
            "v2.9.0",
            "v2.8.0",
            "v2.7.1",
            "v2.6.0",
            "v2.7.0",
            "v2.5.0",
            "v2.2.2",
            "v2.4.1",
            "v2.4.0",
            "v2.3.1",
            "v2.3.0",
            "v2.2.1",
            "V2.2.1",
            "v2.2.0",
            "v2.1.3",
            "v.2.1.3",
            "v2.1.2",
            "v2.1.1",
            "v2.1.0",
            "v2.0.5",
            "v2.0.4",
            "v2.0.3",
            "v2.0.2",
            "v2.0.1",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-63640.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:39.712115932Z",
      "provider": "osv",
      "references": [
        "https://github.com/MagicMirrorOrg/MagicMirror/releases/tag/v2.37.0",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63640.json",
        "https://github.com/MagicMirrorOrg/MagicMirror/security/advisories/GHSA-q4gh-4ffp-5cg8",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-63640",
        "https://github.com/MagicMirrorOrg/MagicMirror/commit/ca7b752025962441196e148f8c1bc04b90117979",
        "https://github.com/MagicMirrorOrg/MagicMirror/pull/4184"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-200"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63640.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-63640",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 507290,
  "published_at": "2026-08-18T17:35:44.944+00:00"
}