CVE-2026-51745
Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Router

Publication date: 2026-09-01

Last updated on: 2026-09-01

Assigner: MITRE

Description
Incorrect access control in the updatePriStaList function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to refresh the primary station list 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
2026-09-21
AI Q&A
2026-09-01
EPSS Evaluated
2026-09-20
NVD
CVE-2026-51745
EUVD
EUVD-2026-69208

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
totolink t6 *
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 flaw in TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to refresh the primary station list 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 or HTTP POST requests to /cgi-bin/cstecgi.cgi with the parameter {"topicurl":"getStaticDhcpRules"}. Check logs for suspicious access attempts to static DHCP configuration rules.

Impact Analysis

An attacker could exploit this to manipulate network settings or disrupt operations by refreshing the primary station list without authentication. This may lead to unauthorized changes in network configuration or potential denial of service.

Compliance Impact

This vulnerability allows unauthenticated access to sensitive network configuration details, which could lead to unauthorized disclosure of network settings. Such information exposure may violate data protection requirements under GDPR or HIPAA if network configurations contain personal or health-related data.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable unnecessary MQTT services if not required. Restrict network access to the device's web interface and CGI endpoints. Monitor for unauthorized access attempts.

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