Meari MQTT broker missing per-device subscribe ACL_CVE-2026-33356

7.7 / 10

HIGH

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

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.

Basic Information

ID CVE-2026-33356

Source runZero

Published May 11, 2026 at 16:02

Affected Product

Vendor Meari

Product IoT Cloud MQTT Broker EMQX

Version 4.x

Affected Versions Meari IoT Cloud MQTT Broker EMQX 4.x

CWE Classification

CWE-639

References

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    "lastseen": "",
    "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.",
    "published": "2026-05-11T16:02:14.046Z",
    "modified": "2026-05-11T16:02:14.046Z",
    "type": "cve",
    "title": "Meari MQTT broker missing per-device subscribe ACL",
    "source": "runZero",
    "references": "https://github.com/xn0tsa/nobody-puts-baby-in-a-corner\nhttps://www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl-cve-2026-33356/",
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    "sourceData": "Meari IoT Cloud MQTT Broker EMQX 4.x",
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    "cvss": {
        "score": 7.7,
        "severity": "HIGH",
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        "version": "3.1"
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