CVE-2026-33356

HIGH SEVERITY

CVSS Score & Metrics

Base Score

7.7 / 10

Vector String

                                        CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N                                    

Vulnerability 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.

Vulnerability Details

Published Date

May 11, 2026

Last Modified

May 13, 2026

CWE ID

CWE-639

Source

NVD

Vendor

Meari

Product

IoT Cloud MQTT Broker EMQX

External References

https://github.com/xn0tsa/nobody-puts-baby-in-a-corner
https://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/

CVE-2026-33356

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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