Read the docs
TI-2026-25762 Aliases CVE-2026-33356GHSA-2vfr-ch7v-7754

Meari MQTT broker missing per-device subscribe ACL

Priority LOW 39CWE-639Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-639.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00274 19th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MeariIoT Cloud MQTT Broker EMQX4.x—No fix listedCNA
  • IoT Cloud MQTT Broker EMQX VendorMeari Affected 4.x Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-33356
  2. 2026-10-03 Alias added: GHSA-2vfr-ch7v-7754
  3. 2026-10-25 Priority changed: MEDIUM → LOW

References

Advisory 1

Other 1

  • TI-2026-25766 Meari SDK hardcoded cryptographic keys CVSS 3.1HIGH 8.6
  • TI-2026-25764 Meari unauthenticated alert image access in cloud object storage CVSS 3.1HIGH 7.5
  • TI-2026-25765 Meari weak XOR obfuscation CVSS 3.1HIGH 7.5
  • TI-2026-25763 Meari OpenAPI device status IDOR CVSS 3.1HIGH 7.5
  • TI-2026-65984 Missing Authorization in Meari IoT Cloud Platform OpenAPI Service CVSS 4.0HIGH 7.1
  • TI-2026-66005 Missing Authorization in Meari IoT Cloud Platform OpenAPI Service CVSS 4.0MEDIUM 6.3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences