CVE-2026-51768: TOTOLINK T6 vulnerability
Published Sep 1, 2026
·Updated
Incorrect access control in the setElinkQosConfig function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to modify privileged QoS policy on the master device 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 change through successful exploitation?
An attacker can modify privileged QoS policy on the master device.
3
Which device version is identified as affected?
The affected product identified in the available data is TOTOLINK T6 version 4.1.5cu.748_B20211015.