CVE-2026-51634
Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: MITRE

Description
Incorrect access control in the getWiFiBasicCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain core wireless settings, including SSIDs and Wi-Fi keys, via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-08-29
AI Q&A
2026-08-29
EPSS Evaluated
N/A
NVD
CVE-2026-51634
EUVD
EUVD-2026-67890

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 TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015. The getWiFiBasicCfg function fails to properly restrict access, allowing unauthenticated attackers to retrieve sensitive wireless settings such as SSIDs and Wi-Fi keys by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, check if your TOTOLINK T6 device is running firmware version 4.1.5cu.748_B20211015. Send a crafted POST request to /cgi-bin/cstecgi.cgi and verify if it returns core wireless settings without authentication.

Impact Analysis

An attacker could exploit this flaw to gain unauthorized access to your Wi-Fi network, intercept network traffic, or launch further attacks against devices connected to the same network. This could lead to data theft, unauthorized use of your internet connection, or compromise of other connected devices.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. If no update is available, restrict access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules and disable unnecessary services.

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