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CVE-2026-51692 – Unauthenticated Guest WiFi Configuration Manipulation – TOTOLINK T6 (Firmware 4.1.5

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Summary

CVE-2026-51692 is an incorrect access control vulnerability in the setWiFiGuestCfg function of TOTOLINK T6 router firmware version 4.1.5cu.748_B20211015. The flaw allows unauthenticated remote attackers to establish or weaken guest wireless network access via a crafted POST request, and it carries a CRITICAL severity rating.

Technical details

  • Root cause: the setWiFiGuestCfg function, exposed through the device’s CGI handler, does not enforce authentication or authorization checks before processing configuration changes.
  • Trigger condition: an attacker sends a crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the setWiFiGuestCfg action.
  • Attack vector: network-based, no authentication or user interaction required, low attack complexity.
  • Impact: attackers can enable, disable, or weaken guest Wi-Fi network settings on the router without credentials, potentially exposing the device and connected network segments to unauthorized wireless access.

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: check the TOTOLINK support site for a firmware build newer than 4.1.5cu.748_B20211015 for the T6 model and apply it; at the time of publication no vendor-confirmed fixed version was identified.
  • If no patch is available: restrict management/administrative interfaces (including /cgi-bin/cstecgi.cgi) from being reachable over the internet, place the device behind a firewall or VPN, disable remote management, and monitor for unexpected changes to guest Wi-Fi configuration.

How IONIX identifies potentially affected assets

IONIX matches the following signals against data already collected when it crawled the asset; identifying the technology sends no request beyond that crawl.

  • Raw response body: /cgi-bin/cstecgi.cgi
  • Page title: TOTOLINK

References

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Map your entire attack surface (continously)

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4

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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