CVE-2026-33356

Meari MQTT broker missing per-device subscribe ACL

Published May 11, 2026 CVSS 3.1 · 7.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Meari
Meari iot Cloud Mqtt Broker Emqx
Vendors & Products Meari
Meari iot Cloud Mqtt Broker Emqx
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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.
Title Meari MQTT broker missing per-device subscribe ACL
Weaknesses CWE-639
References
Metrics cvssV3_1

{'score': 7.7, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
runZero
Published
Updated
May 11, 2026, 6:18 PM
Reserved
Mar 19, 2026, 12:27 AM
Status
Deferred
Published
May 11, 2026, 5:16 PM
Modified
Oct 26, 2026, 6:10 PM