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CVE-2026-51710 – Unauthenticated Access Control Bypass – TOTOLINK T6 firmware 4.1.5cu.748_B20211015

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Summary

CVE-2026-51710 is an improper access control vulnerability in the setParentalRules function of the TOTOLINK T6 router, firmware version 4.1.5cu.748_B20211015. The flaw allows an unauthenticated, remote attacker to alter the device’s parental-control configuration by sending a crafted POST request to the router’s CGI management interface. The issue carries a CVSS v3.1 base score of 9.1 (Critical).

Technical details

  • Root cause: the setParentalRules function in /cgi-bin/cstecgi.cgi fails to enforce authentication/authorization checks before processing requests that modify parental-control rules.
  • Trigger: an attacker sends a specially crafted HTTP POST request directly to /cgi-bin/cstecgi.cgi invoking setParentalRules, with no valid session or credentials required.
  • Attack vector: network-based, requiring no privileges and no user interaction (AV:N/AC:L/PR:N/UI:N).
  • Impact: unauthorized attackers can view and change parental-control behavior on the device, resulting in high confidentiality and integrity impact; availability is not affected.

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/download portal for a firmware update addressing this issue for the T6 model and apply it as soon as it is available; no patched version was confirmed publicly at time of writing.
  • If no patch is available: restrict access to the router’s web management interface (/cgi-bin/cstecgi.cgi) to trusted internal networks only, disable remote/WAN administration, and place management interfaces behind a VPN or firewall ACL to block unauthenticated internet access.
  • General hardening: monitor for unexpected changes to parental-control settings and review router configurations for unauthorized modifications.

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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