CVE-2026-33356
Meari MQTT broker missing per-device subscribe ACL
- State
- Published
- Severity
- 7.7 High
- Published
- May 11, 2026
- Updated
- May 11, 2026
- Reserved
- Mar 19, 2026
Description
In Meari IoT Cloud MQTT Broker deployments running EMQX 4.x, any authenticated low-privilege account can subscribe to global wildcard topics and receive telemetry from devices the user does not own. The broker enforces publish restrictions but does not enforce equivalent subscribe authorization at per-device scope.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 7.7 High | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N | runZero |
Weaknesses
- CWE-639 Authorization Bypass Through User-Controlled Key
Affected Products
| Product | Versions |
|---|---|
IoT Cloud MQTT Broker EMQXMeari |
|
References
- https://github.com/xn0tsa/nobody-puts-baby-in-a-cornertechnical-description
- https://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/third-party-advisory
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