CVE-2026-33356Public exploitNetwork attack vector

Cross-tenant telemetry disclosure via wildcard subscription

Published May 11, 2026 · Updated May 11, 2026

Authorization bypass in Meari IoT Cloud MQTT Broker EMQX 4.x allows remote authenticated users to read other devices' telemetry. The broker accepts the global meari/# subscription topic from low-privilege accounts without applying a per-device subscribe ACL to isolate tenants. A normal cloud account can continuously receive platform-wide motion alerts, device identifiers, account data, and camera-artifact links.

CVSS severity7.7
High
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authorization bypass in Meari IoT Cloud MQTT Broker EMQX 4.x allows remote authenticated users to read other devices' telemetry. The broker accepts the global meari/# subscription topic from low-privilege accounts without applying a per-device subscribe ACL to isolate tenants. A normal cloud account can continuously receive platform-wide motion alerts, device identifiers, account data, and camera-artifact links.

The record

CVE
CVE-2026-33356
Published
May 11, 2026
Updated
May 11, 2026
Vendor
Meari
Product
IoT Cloud MQTT Broker
Classifications
CWE-639, T1213
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 11, 2026CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.x

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Meari · IoT Cloud MQTT Brokerversion=4.x

Published CVSS scores

7.7runZeroCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1213Data from Information Repositories

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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