CVE-2026-63640

CVE-2026-63640 · MagicMirror socket payload secret placeholder expansion can disclose SECRET_* environment variables

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 4.3 · Medium · EPSS 0.3% · Fix available

Published

2026-08-18T17:35:44.944Z

Updated

2026-08-18T17:56:32.044Z

Stack: node

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