CVE-2026-51743: Critical severity TOTOLINK T6 vulnerability
Published Sep 1, 2026
·Updated
Incorrect access control in the guestwifisync function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to disable guest virtual AP interfaces 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
Data Sourced
via NVD·01:19 PM
DescriptionSeverityWeakness
Frequently Asked Questions
1
What access does an attacker need to exploit this issue?
An attacker does not need to authenticate. Exploitation requires sending a crafted MQTT message to the device's cs_broker component.
2
What is the practical impact of successful exploitation?
A successful attacker can disable guest virtual AP interfaces, disrupting guest Wi-Fi availability.
3
Which device version is identified as affected?
The affected product and version identified are TOTOLINK T6 firmware 4.1.5cu.748_B20211015.