CVE-2026-51711

Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-31

Last updated on: 2026-09-01

Assigner: MITRE

Description

Incorrect access control in the setWiFiWpsStart function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to open a wireless pairing window via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

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Meta Information

Published

2026-08-31

Last Modified

2026-09-01

Generated

2026-09-20

AI Q&A

2026-08-31

EPSS Evaluated

2026-09-15

NVD

CVE-2026-51711

EUVD

EUVD-2026-68638

Affected Vendors & Products

Vendor	Product	Version / Range
totolink	t6	4.1.5cu.748_b20211015

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-284	The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Attack-Flow Graph

Executive Summary

This vulnerability is an incorrect access control issue in the setWiFiWpsStart function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to open a wireless pairing window by sending a specially crafted POST request to the vulnerable endpoint /cgi-bin/cstecgi.cgi.

Detection Guidance

To detect this vulnerability, check if the TOTOLINK T6 device is running firmware version 4.1.5cu.748_B20211015 or similar. Inspect network traffic for POST requests to /cgi-bin/cstecgi.cgi that attempt to access the setWiFiWpsStart function without authentication.

Impact Analysis

An attacker could exploit this to gain unauthorized access to the Wi-Fi network, potentially intercepting sensitive data or launching further attacks on connected devices. It compromises the security of the wireless network.

Compliance Impact

This vulnerability allows unauthenticated attackers to open a wireless pairing window via crafted POST requests, which could lead to unauthorized network access. Such access may compromise data confidentiality and integrity, potentially violating compliance requirements under GDPR (data protection) and HIPAA (health data security).

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest version. Disable WPS functionality if not needed. Block external access to the /cgi-bin/cstecgi.cgi endpoint via firewall rules. Monitor network traffic for suspicious POST requests to this path.

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