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CVE-2026-51680 – Unauthenticated LED Configuration Manipulation – TOTOLINK T6 (Firmware 4.1.5cu.748_

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Summary

CVE-2026-51680 is an incorrect access control vulnerability (CWE-284) in the setLedCfg function of TOTOLINK T6 firmware version 4.1.5cu.748_B20211015. The flaw allows unauthenticated remote attackers to modify LED behavior on the device by sending a crafted POST request to the /cgi-bin/cstecgi.cgi endpoint. The vulnerability has been assigned a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: the setLedCfg function within the device’s CGI web management handler (/cgi-bin/cstecgi.cgi) does not enforce authentication before processing configuration requests.
  • Trigger condition: an attacker sends a specially crafted POST request targeting the setLedCfg action to the exposed CGI endpoint.
  • Attack vector: network-based, requires no privileges and no user interaction, and has low attack complexity.
  • Impact: unauthenticated modification of LED configuration/behavior on the affected device.

Affected software

  • TOTOLINK T6, firmware version 4.1.5cu.748_B20211015

Severity

  • CVSS v3.1 Base Score: 9.1 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Mitigation and recommended actions

  • Immediate: No vendor-supplied patched firmware version has been identified for this issue at time of publication. Check TOTOLINK’s official support channels for updated firmware for the T6 model.
  • If no patch is available: Remove internet-facing exposure of the device’s web management interface; restrict access to /cgi-bin/cstecgi.cgi to trusted management networks only (e.g., via firewall rules or VPN); disable remote/WAN administration if enabled; monitor for unexpected POST requests to the CGI interface.

References

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