CVE-2026-33356— Meari MQTT broker missing per-device subscribe ACL
Possible ATT&CK Techniques 1AI
T1530 · Data from Cloud StorageAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
通过用户控制密钥绕过授权机制
Source: NVD (National Vulnerability Database)
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
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://github.com/xn0tsa/nobody-puts-baby-in-a-cornertechnical-description
- https://nvd.nist.gov/vuln/detail/CVE-2026-33356
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 weakness: CWE-639
- CVE-2026-45666
Open WebUI: Indirect Object Reference (IDOR) in user notes - CVE-2026-44570
Open WebUI: Inconsistent authorization controls within memor - CVE-2026-45402
Open WebUI: Cross-User File Access via Unchecked file_id in - CVE-2026-45386
Open WebUI: An IDOR vulnerability exists in the pin_channel_ - CVE-2026-45398
Open WebUI: IDOR - Retrieval API Bypasses Knowledge Base Acc
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