CVE-2026-51722
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 setWiFiRepeaterCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to repoint the device to an attacker-controlled upstream Wi-Fi 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-2026-51722
EUVD
EUVD-2026-68673

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 setWiFiRepeaterCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to change the device's upstream Wi-Fi network to one controlled by the attacker by sending a specially crafted POST request to the device's web interface at /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 WiFiRepeaterCfg. Check device logs for unauthorized changes to WiFi settings or upstream network repointing.

Impact Analysis

This vulnerability could allow attackers to redirect your internet traffic through their own network, potentially intercepting sensitive data like passwords or personal information. It may also enable attackers to monitor or manipulate your network traffic without your knowledge.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable remote administration if not needed. Restrict access to the device's web interface via network segmentation or firewall rules.

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