CVE-2026-51744

Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-09-01

Last updated on: 2026-09-02

Assigner: MITRE

Description

Incorrect access control in the recv_mesh_info_sync function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to force mesh configuration synchronization from an attacker-controlled host via sending a crafted MQTT message to the cs_broker component.

CVSS Scores

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Meta Information

Published

2026-09-01

Last Modified

2026-09-02

Generated

2026-09-21

AI Q&A

2026-09-01

EPSS Evaluated

2026-09-20

NVD

CVE-2026-51744

EUVD

EUVD-2026-69209

Affected Vendors & Products

Vendor	Product	Version / Range
totolink	t6	4.1.5cu.748_b20211015

Helpful Resources

Exploitability

CWE

KEV

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

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect access control issue in the recv_mesh_info_sync function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to force mesh configuration synchronization from a host they control by sending a specially crafted MQTT message to the cs_broker component.

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 mesh configuration synchronization requests from untrusted sources.

Impact Analysis

An attacker could exploit this to alter mesh network settings, potentially disrupting network operations or intercepting traffic. This may lead to unauthorized access to network resources or sensitive data transmitted over the mesh network.

Compliance Impact

This vulnerability allows unauthenticated attackers to manipulate mesh configuration synchronization via crafted MQTT messages, which could lead to unauthorized access or data exposure. Such unauthorized access risks may violate compliance requirements under GDPR (data protection) and HIPAA (patient data security) by enabling data breaches or unauthorized system modifications.

Mitigation Strategies

Immediately update TOTOLINK T6 firmware to the latest version to patch the incorrect access control in recv_mesh_info_sync. Disable unnecessary MQTT services on the device if possible. Monitor network traffic for suspicious MQTT messages targeting the cs_broker component.

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