CVE-2026-33356highCWE-639

CVE-2026-33356: high-severity vulnerability in Meari IoT Cloud MQTT Broker EMQX

Meari MQTT broker missing per-device subscribe ACL

Published

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21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.7epss 0.3%
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:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Affected products
Meari · IoT Cloud MQTT Broker EMQX