CVE-2026-71279
Zigbee2MQTT External JS Extension Path Traversal Leading to Remote Code Execution
CVSS Score
8.1
EPSS Score
0.0%
EPSS Percentile
0th
Zigbee2MQTT's ExternalJSExtension.getFilePath (lib/extension/externalJS.ts) joins a parameter received via an MQTT message (topic zigbee2mqtt/bridge/request/extension/save) into the extensions base path using path.join(basePath, name) with no sanitization. The extension handler only validates that the name ends in .js/.mjs/.cjs, writes the file, and then dynamically imports it via Node.js import, achieving remote code execution.
| CWE | CWE-22 |
| Vendor | koenkk |
| Product | zigbee2mqtt |
| Published | Aug 5, 2026 |
| Last Updated | Aug 10, 2026 |
Stay Ahead of the Next One
Get instant alerts for koenkk zigbee2mqtt
Be the first to know when new high vulnerabilities affecting koenkk zigbee2mqtt are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Koenkk / zigbee2mqtt
0 ≤ 2.12.0
References
Credits
Alibek Baxtiyorov