CVE-2026-51752
Deferred Deferred - Pending Action

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 staticInfoSend function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to trigger static information reporting to the configured master 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
2026-09-22
AI Q&A
2026-09-01
EPSS Evaluated
2026-09-20
NVD
CVE-2026-51752
EUVD
EUVD-2026-69203

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 staticInfoSend function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to send a specially crafted MQTT message to the cs_broker component, which forces the device to report static information to a configured master server without requiring any authentication.

Detection Guidance

Detecting this vulnerability requires monitoring for unauthorized MQTT messages sent to the cs_broker component on TOTOLINK T6 devices. Check network traffic for unexpected MQTT packets targeting port 1883 or 8883. Inspect logs for staticInfoSend function triggers without valid authentication.

Impact Analysis

This vulnerability could allow attackers to remotely extract sensitive device information without authorization. This might include network configurations, device identifiers, or other static data that could be used for further attacks or reconnaissance on the network.

Compliance Impact

This vulnerability allows unauthenticated attackers to access static information reporting, which could lead to unauthorized data exposure. This may violate compliance requirements under GDPR (data protection) and HIPAA (health data privacy) by enabling unauthorized access to sensitive information.

Mitigation Strategies

Immediately update TOTOLINK T6 firmware to the latest version to fix the access control issue in the staticInfoSend function. Disable unnecessary MQTT services if not required. Monitor network traffic for unusual MQTT message exchanges to the cs_broker component.

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