Lack of MQTT Broker Topic Access Control Lists
CVE-2026-49186

8.6HIGH

Key Information:

Vendor

Acer

Status
Connect M6e 5g Portable Wifi Router
Vendor
CVE Published:
4 June 2026

What is CVE-2026-49186?

The local MQTT broker does not enforce topic-level Access Control Lists (ACLs). This allows any client to subscribe using wildcard characters (# or +) to enumerate hidden network devices or publish rogue control commands.

Affected Version(s)

Connect M6E 5G Portable WiFi Router *

References

https://community.acer.com/en/kb/articles/19707

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Ta-Lun Yen
.