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CVE-2026-51726 – Improper Access Control (Unauthenticated Parental-Rule Removal) – TOTOLINK T6 4.1.5

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Summary

CVE-2026-51726 is an improper access control vulnerability (CWE-284) in the delParentalRules function of the TOTOLINK T6 router web management interface, firmware version 4.1.5cu.748_B20211015. The flaw allows an unauthenticated, remote attacker to remove parental-control rules by sending a crafted POST request to the device’s CGI handler. It carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: the delParentalRules function does not enforce authentication/authorization before processing the request that deletes parental-control rules.
  • Trigger: sending a crafted HTTP POST request to /cgi-bin/cstecgi.cgi invoking the delParentalRules function.
  • Attack vector: network-based, no authentication and no user interaction required.
  • Impact: an unauthenticated attacker can remove existing parental-control rules on the device, undermining content/access restrictions configured by the administrator.

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 specific issue at the time of publication; check the TOTOLINK support/download page for the T6 model for updated firmware and apply it as soon as it is released.
  • If no patch is available: restrict access to the router’s web management interface to trusted networks only (disable remote/WAN administration), place management interfaces behind a VPN or firewall, and monitor for unexpected POST requests to /cgi-bin/cstecgi.cgi.
  • Consider replacing end-of-life or unsupported TOTOLINK hardware if no fix is issued by the vendor.

References

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