CVE-2026-51652

Deferred Deferred - Pending Action

Incorrect Access Control in TOTOLINK T6 Firmware

Publication date: 2026-08-28

Last updated on: 2026-09-01

Assigner: MITRE

Description

Incorrect access control in the getUPnPCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to obtain UPnP enablement and parsed port-mapping information via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-28

Last Modified

2026-09-01

Generated

2026-09-18

AI Q&A

2026-08-29

EPSS Evaluated

2026-09-15

NVD

CVE-2026-51652

EUVD

EUVD-2026-67882

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 getUPnPCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. It allows unauthenticated attackers to retrieve UPnP enablement status and port-mapping details 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. Send a crafted POST request to /cgi-bin/cstecgi.cgi and observe if it returns UPnP enablement or port-mapping details without authentication.

Impact Analysis

An attacker could exploit this to gather sensitive network configuration details without authentication. This may enable further attacks such as unauthorized port forwarding, exposing internal services, or facilitating man-in-the-middle attacks on the local network.

Compliance Impact

This vulnerability allows unauthenticated attackers to access UPnP configuration and port-mapping details, which could expose network services and device settings. Such unauthorized access may violate data protection requirements under GDPR (e.g., unauthorized data access) and HIPAA (e.g., network security controls for protected health information).

Mitigation Strategies

Immediately update the TOTOLINK T6 firmware to the latest patched version. If no patch is available, restrict access to the device's web interface and disable UPnP functionality until a fix is applied.

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