CVE-2026-33356
High
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.
SeverityHigh
CVSS7.7
Exploit probability—
ProductIoT Cloud MQTT Broker EMQX
PublishedMay 11, 2026
First seenMay 11, 2026
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Meari IoT Cloud MQTT Broker EMQX | 4.x | — |
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