CVE-2026-51757: TOTOLINK T6 vulnerability
Published Sep 1, 2026
·Updated
Incorrect access control in the meshSlaveUpdate function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to start a firmware download or flash workflow on the slave 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
Data Sourced
via NVD·02:17 PM
Description
Frequently Asked Questions
1
What access does an attacker need to exploit this issue?
An attacker does not need to authenticate. Exploitation requires the ability to send a crafted MQTT message to the cs_broker component.
2
What can an attacker cause if exploitation succeeds?
An attacker can initiate a firmware download or flash workflow on the slave device through the affected meshSlaveUpdate function.
3
How can I determine whether a device is affected?
The affected product and firmware identified in the available data are TOTOLINK T6 running version 4.1.5cu.748_B20211015.