CVE-2026-51766
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: MITRE

Description
Incorrect access control in the setDevReboot function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to reboot the local device and, on a master, fan out reboot commands to mesh slaves via sending a crafted MQTT message to the cs_broker component.

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Meta Information

Published
2026-09-01
Last Modified
2026-09-01
Generated
2026-09-01
AI Q&A
2026-09-01
EPSS Evaluated
N/A
NVD
CVE-2026-51766
EUVD
EUVD-2026-69193

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
totolink t6 4.1.5cu.748_b20211015

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-284 The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

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Executive Summary

This vulnerability is an incorrect access control issue in the setDevReboot function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to reboot the device by sending a specially crafted MQTT message to the cs_broker component. On a master device in a mesh network, this can also trigger reboot commands to connected slave devices.

Detection Guidance

To detect this vulnerability, monitor network traffic for unauthorized MQTT messages sent to the cs_broker component on TOTOLINK T6 devices. Check for unexpected reboot commands or unusual MQTT message patterns targeting the setDevReboot function.

Impact Analysis

This vulnerability could allow attackers to remotely reboot your TOTOLINK T6 router without authentication. This may cause temporary loss of internet connectivity, disrupt network services, or potentially lead to denial-of-service conditions. Attackers could also use it to repeatedly reboot devices, causing persistent disruption.

Compliance Impact

This vulnerability allows unauthenticated attackers to reboot devices via crafted MQTT messages, which could disrupt critical operations. For GDPR, this may impact availability of personal data processing systems. For HIPAA, it could affect the integrity and availability of protected health information systems.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version to address the incorrect access control in setDevReboot. Disable unnecessary MQTT services if not required. Restrict network access to the device to trusted sources only.

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