CVE-2026-51770: TOTOLINK T6 vulnerability
Published Sep 1, 2026
·Updated
Incorrect access control in the sendToMasterQosConfig function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to forward attacker-controlled QoS settings to the master via sending a crafted MQTT message to the csbroker component..
Affected Software
1 affected component
TOTOLINK T6=4.1.5cu.748_B20211015
Event History
Sep 1, 2026
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Frequently Asked Questions
1
What access does an attacker need to exploit this issue?
The attacker does not need to authenticate. Exploitation requires sending a crafted MQTT message to the cs_broker component.
2
What can an attacker control through successful exploitation?
An attacker can forward attacker-controlled QoS settings to the master through the sendToMasterQosConfig function.
3
How can I determine whether a device is affected?
The affected product and version identified in the available data are TOTOLINK T6 running 4.1.5cu.748_B20211015. The provided information does not identify other affected versions or a detection method.