CVE-2026-33356 HIGH

CVE-2026-33356: Meari MQTT broker missing per-device subscribe ACL

Vendor Meari
Product IoT Cloud MQTT Broker EMQX
Weakness CWE-639 · IDOR
Published May 11, 2026
Last update May 11, 2026
View on NVD All CVEs

CVSS base score

7.7/10
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Confidentiality High
Integrity None

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 11, 2026 CVE published
May 11, 2026 Record updated