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

Quick assessment

Affected
Meari IoT Cloud MQTT Broker EMQX
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Meari IoT Cloud MQTT Broker EMQX是中国觅睿（Meari）公司的一个基于 MQTT 协议的高性能物联网消息代理服务。 Meari IoT Cloud MQTT Broker EMQX 4.x版本存在安全漏洞，该漏洞源于未对设备级订阅进行授权，可能导致任何经过身份验证的低权限账户订阅全局通配符主题并接收不属于用户的设备遥测数据。

CVSS 7.7 · High EPSS 0.35% · P27

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 1

VendorProduct Version RangeStatus
Meari IoT Cloud MQTT Broker EMQX 4.x affected
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I. Basic Information for CVE-2026-33356

Vulnerability Information
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Vulnerability Title
Meari MQTT broker missing per-device subscribe ACL
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: CVE Program / CVE List V5
Vulnerability Title
Meari IoT Cloud MQTT Broker EMQX 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Meari IoT Cloud MQTT Broker EMQX是中国觅睿（Meari）公司的一个基于 MQTT 协议的高性能物联网消息代理服务。 Meari IoT Cloud MQTT Broker EMQX 4.x版本存在安全漏洞，该漏洞源于未对设备级订阅进行授权，可能导致任何经过身份验证的低权限账户订阅全局通配符主题并接收不属于用户的设备遥测数据。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Meari IoT Cloud MQTT Broker EMQX 4.x -

II. Public POCs for CVE-2026-33356

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III. Intelligence Information for CVE-2026-33356

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Vendor Advisories for CVE-2026-33356 (1)

Other References for CVE-2026-33356 (1)

Same Patch Batch · Meari · 2026-05-11 · 5 CVEs total

CVE-2026-33362 8.6 HIGH Meari SDK hardcoded cryptographic keys
CVE-2026-33359 7.5 HIGH Meari unauthenticated alert image access in cloud object storage
CVE-2026-33357 7.5 HIGH Meari OpenAPI device status IDOR
CVE-2026-33361 7.5 HIGH Meari weak XOR obfuscation

IV. Related Vulnerabilities

Same vendor: Meari
Same weakness: CWE-639

V. Comments for CVE-2026-33356

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