CVE-2026-71279 Zigbee2MQTT External JS Extension Path Traversal Leading to Remote Code Execution

Zigbee2MQTT's ExternalJSExtension.getFilePath lib/extension/externalJS.ts joins a name parameter received via an MQTT message topic zigbee2mqtt/bridge/request/extension/save into the extensions base path using path.joinbasePath, name with no sanitization. Because path.join resolves ../ sequences,...