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CVE-2026-51708 – Unauthenticated WPS Configuration Tampering – TOTOLINK T6 Router Firmware 4.1.5cu.7

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Summary

CVE-2026-51708 is an incorrect access control vulnerability (CWE-284) in the setWiFiWpsCfg function of the TOTOLINK T6 web management interface, firmware version 4.1.5cu.748_B20211015. The flaw allows a remote, unauthenticated attacker to change the device’s WPS (Wi-Fi Protected Setup) availability by sending a crafted POST request to /cgi-bin/cstecgi.cgi. It carries a CVSS v3.1 base score of 9.8 (Critical).

Technical details

  • Root cause: The setWiFiWpsCfg function in /cgi-bin/cstecgi.cgi fails to enforce authentication or authorization checks before processing requests that alter WPS settings.
  • Trigger conditions: An attacker sends an HTTP POST request to /cgi-bin/cstecgi.cgi with topicurl=setWiFiWpsCfg and associated WPS parameters, with no valid session or credentials required.
  • Attack vector: Network-based, requiring no authentication and no user interaction (AV:N/AC:L/PR:N/UI:N).
  • Impact: Successful exploitation lets an unauthenticated attacker change WPS availability on the device, which can weaken wireless security controls and expose the network to further attack. CISA’s SSVC assessment rates the attack as automatable with total technical impact.

Affected software

  • TOTOLINK T6, firmware version 4.1.5cu.748_B20211015

Severity

  • CVSS v3.1 Base Score: 9.8 (Critical)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Mitigation and recommended actions

  • Immediate: No confirmed patched firmware version has been published by TOTOLINK for this vulnerability at the time of writing; check the TOTOLINK support/download portal for the T6 model regularly for an updated firmware release addressing this issue.
  • If no patch is available:
    • Restrict access to the router’s web management interface (/cgi-bin/cstecgi.cgi) to trusted internal networks only; do not expose it to the internet.
    • Disable remote/WAN-side administration on the device if enabled.
    • Place management interfaces behind a VPN or firewall rule limiting access to known administrator IP addresses.
    • Monitor for unexpected changes to WPS settings and disable WPS entirely if not required.

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, TOTOLINK

References

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