CVE-2026-51723
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 UploadCustomModule function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to install a custom CGI module 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-2026-51723
EUVD
EUVD-2026-68672

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 UploadCustomModule function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to install a custom CGI module by sending a specially crafted POST request to the 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 UploadCustomModule. Check server logs for unauthorized CGI module installations or unexpected POST requests.

Impact Analysis

An attacker could exploit this to gain unauthorized control over the device, install malicious modules, or execute arbitrary commands. This could lead to data theft, device compromise, or further network infiltration.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable remote access to the web interface if not required. Block external access to /cgi-bin/cstecgi.cgi via firewall rules. Monitor for suspicious activity or unauthorized module installations.

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