CVE-2026-49186 PUBLISHED

Lack of MQTT Broker Topic Access Control Lists

Assigner: Acer
Reserved: 28.05.2026 Published: 04.06.2026 Updated: 04.06.2026

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.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.6

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	High	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	High
User Interaction	None

CVSS 4.0

Product Status

Vendor	Acer
Product	Connect M6E 5G Portable WiFi Router
Versions	Default: unaffected affected from * to M6E_AI_1.00.000019 (incl.)

Credits

Ta-Lun Yen finder

References

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

Problem Types

CWE-287: Improper Authentication CWE

Impacts

CAPEC-122 (Privilege Abuse/Access Control Bypass)