CVE-2026-51728
Received Received - Intake

Incorrect Access Control in TOTOLINK T6 Firmware Upload

Publication date: 2026-08-31

Last updated on: 2026-08-31

Assigner: MITRE

Description
Incorrect access control in the UploadFirmwareFile function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to upload a crafted firmware image 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-2026-51728
EUVD
EUVD-2026-68713

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 UploadFirmwareFile function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to upload a malicious firmware image by sending a specially crafted POST request to the device's web interface endpoint /cgi-bin/cstecgi.cgi.

Impact Analysis

This vulnerability could allow attackers to upload malicious firmware to your TOTOLINK T6 device without authentication. This could lead to unauthorized control of the device, potential data theft, network compromise, or disruption of network services.

Mitigation Strategies

Immediately restrict access to the /cgi-bin/cstecgi.cgi endpoint on TOTOLINK T6 devices. Disable unauthenticated firmware upload functionality if possible. Monitor network traffic for POST requests to this path and block suspicious requests.

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