CVE-2026-51692
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Router Firmware

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: MITRE

Description
Incorrect access control in the setWiFiGuestCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to establish or weaken guest wireless access 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-2026-51692
EUVD
EUVD-2026-68587

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 setWiFiGuestCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to manipulate guest wireless network access by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, monitor network traffic for POST requests to /cgi-bin/cstecgi.cgi with parameters related to WiFi guest configuration. Check logs for unauthorized access attempts or changes to guest wireless settings.

Impact Analysis

An attacker could exploit this to enable unauthorized guest WiFi access, disable existing guest network restrictions, or weaken security settings without authentication. This could allow unauthorized users to connect to the network or bypass intended access controls.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable guest wireless access if not needed. Restrict access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules. Monitor network traffic for suspicious POST requests.

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