CVE-2026-33356

HIGH EPSS 19.2%

Published May 11, 20261mo ago · Modified Jun 17, 20262w ago

7.7 CVSS 3.1

High

Published May 11, 2026 1mo ago

Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score

7.7

Exploitability

3.1

Impact

4.0

Vector string

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

Attack Vector Network

Attack Complexity Low

Privileges Required Low

User Interaction None

Scope Changed

Confidentiality High

Integrity None

Availability None

Threat Intelligence

EPSS Exploit Probability

19.2% percentile

Exploit & Patch Status

No Known Exploit

No Patch Available

Weaknesses 1

CWE-639

References 2

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

Remediation

No remediation data recorded yet

Check vendor advisories and the NVD entry for patch availability.