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HIGHCVE-2026-33356Published Modified CNA runZero

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

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.

Metrics

CVSS v3.1
7.7
Severity
HIGH
Fixed in
—
Affected Products
1
Affected packages
  • Meari / IoT Cloud MQTT Broker EMQX
    4.x
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
References