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CVE-2026-51711 – Unauthenticated WPS Pairing Activation (Access Control Bypass) – TOTOLINK T6 4.1.5c

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Summary

CVE-2026-51711 is an incorrect access control vulnerability (CWE-284) in the setWiFiWpsStart function of the TOTOLINK T6 router web management interface, firmware version 4.1.5cu.748_B20211015. The flaw allows an unauthenticated remote attacker to send a crafted POST request to /cgi-bin/cstecgi.cgi and open a Wi-Fi Protected Setup (WPS) pairing window without any credentials. The issue carries a CVSS v3.1 base score of 9.1 (Critical) and requires no user interaction to exploit.

Technical details

  • Root cause: the setWiFiWpsStart handler in cstecgi.cgi does not verify that the requesting client is authenticated before acting on the request.
  • Trigger condition: sending an HTTP POST request to /cgi-bin/cstecgi.cgi containing {"topicurl":"setWiFiWpsStart"} along with WPS mode parameters.
  • Attack vector: network-based, no authentication or user interaction required (AV:N/AC:L/PR:N/UI:N).
  • Impact: an attacker can remotely activate WPS pairing mode on the device, opening a window during which unauthorized wireless clients may be able to join the network — undermining the confidentiality and integrity of the wireless network without needing valid credentials.

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 official patched firmware version has been identified as of this writing; check TOTOLINK’s support/download page for the T6 model regularly for an updated firmware release that addresses 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, and disable remote/WAN-side administration.
  • Disable WPS functionality on the device if it is not required, to eliminate the exposed attack surface.
  • Monitor devices joining the wireless network for unauthorized or unexpected clients, particularly around unexplained WPS pairing events.
  • Consider replacing or isolating affected devices on a segmented network if they cannot be updated.

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, N600R (Firmware version V...), TOTOLINK

References

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