CVE-2026-33356
HighSummary
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.
Risk Assessment
The organization may be exposed to unauthorized access to telemetry data from devices, which could lead to privacy and security breaches. Low-privilege users may gain access to information that should not be available to them.
Recommendation
It is recommended to review and adjust the subscription authorization policy in the MQTT broker to ensure that users can only subscribe to topics related to devices they own. Additionally, consider implementing extra security layers for low-privilege accounts.
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Original NVD description (English source)
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.