Meari MQTT broker missing per-device subscribe ACL

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Summary

CVECVE-2026-33356
StatePUBLISHED
AssignerrunZero
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-11 17:16:30 UTC
Updated2026-05-11 17:16:30 UTC
DescriptionIn 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 And Classification

Primary CVSS: v3.1 7.7 HIGH from 44488dab-36db-4358-99f9-bc116477f914

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

EPSS: 0.000280000 probability, percentile 0.081430000 (date 2026-05-12)

Problem Types: CWE-639 | CWE-639 CWE-639 Authorization Bypass Through User-Controlled Key

VersionSourceTypeScoreSeverityVector
3.144488dab-36db-4358-99f9-bc116477f914Secondary7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N
3.1CNACVSS7.7HIGHCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Meari IoT Cloud MQTT Broker EMQX affected 4.x custom Not specified

References

ReferenceSourceLinkTags
www.runzero.com/advisories/meari-mqtt-broker-missing-per-device-subscribe-acl... 44488dab-36db-4358-99f9-bc116477f914 www.runzero.com
github.com/xn0tsa/nobody-puts-baby-in-a-corner 44488dab-36db-4358-99f9-bc116477f914 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Sammy Azdoufal (en)

CNA: Tod Beardsley of runZero, Inc. (en)

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