CVE-2026-33356

Published: May 11, 2026Modified: Jun 17, 2026Deferred

7.7

Vector

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

Exploitability: 3.1 / Impact: 4.0

Source: 44488dab-36db-4358-99f9-bc116477f914 (Secondary)

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.

Related CWEs

CWE-639

Authorization Bypass Through User-Controlled Key

The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.

References (2)

https://github.com/xn0tsa/nobody-puts-baby-in-a-corner

Source: 44488dab-36db-4358-99f9-bc116477f914

https://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/

Source: 44488dab-36db-4358-99f9-bc116477f914

Timeline

No history available yet.