CVE-2026-51669
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: MITRE

Description
Incorrect access control in the getPairCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain pairing and mesh-slave configuration via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

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Meta Information

Published
2026-08-31
Last Modified
2026-08-31
Generated
2026-08-31
AI Q&A
2026-08-31
EPSS Evaluated
N/A
NVD
CVE-2026-51669
EUVD
EUVD-2026-68532

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

CVE-2026-51669 is an incorrect access control vulnerability in TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve sensitive network configuration details by sending a crafted POST request to the device's web interface.

Detection Guidance

To detect this vulnerability, monitor HTTP POST requests to /cgi-bin/cstecgi.cgi with the parameter {"topicurl":"getStaticDhcpRules"}. Check for unauthorized access attempts or responses containing DHCP static lease rules.

Impact Analysis

This vulnerability could allow attackers to access DHCP static lease rules or other network configurations without authentication. This may lead to unauthorized changes to network settings, potential disruption of network services, or exposure of sensitive network information.

Compliance Impact

This vulnerability allows unauthenticated access to sensitive network configuration details, which could lead to unauthorized disclosure of DHCP or mesh-slave settings. Such information exposure may violate data protection requirements under GDPR or HIPAA if it involves personal or sensitive data handling.

Mitigation Strategies

Immediately update TOTOLINK T6 firmware to the latest version. Restrict access to /cgi-bin/cstecgi.cgi via network firewall rules. Monitor logs for suspicious POST requests to this endpoint.

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