CVE-2026-51761
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 updateLanIp function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to refresh the LAN address state 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-2026-51761
EUVD
EUVD-2026-69198

Affected Vendors & Products

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

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is an incorrect access control issue in the TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to manipulate the LAN IP address state by sending a specially crafted MQTT message to the cs_broker component.

Impact Analysis

An attacker could exploit this to disrupt network operations by changing the LAN IP configuration, potentially causing network outages or unauthorized access to connected devices.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version to address the incorrect access control in the updateLanIp function. Disable unnecessary MQTT services or restrict access to the cs_broker component to prevent unauthenticated message injection.

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