CVE-2026-51691
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 setUploadSetting function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to manipulate the upload or flash workflow 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-2026-51691
EUVD
EUVD-2026-68586

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
totolink t6 4.1.5cu.748_b20211015

Helpful Resources

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 setUploadSetting function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to manipulate the upload or flash workflow by sending a crafted POST request to /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 upload or flash settings. Check server logs for unauthorized access attempts to this endpoint.

Impact Analysis

An attacker could exploit this to gain unauthorized control over the device's firmware or upload malicious files, potentially leading to system compromise, data theft, or further network infiltration.

Compliance Impact

This vulnerability allows unauthenticated attackers to manipulate upload or flash workflows via crafted POST requests, which could lead to unauthorized changes in device configuration or firmware. Such unauthorized access may violate data integrity and confidentiality requirements under standards like GDPR and HIPAA, potentially resulting in non-compliance due to lack of proper access controls.

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Restrict access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules. Disable unnecessary services and monitor for suspicious POST requests.

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