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CVE-2026-51672 – Unauthenticated Information Disclosure – TOTOLINK T6 Router (Firmware 4.1.5cu.748_B

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Summary

CVE-2026-51672 is an incorrect access control (missing authentication) vulnerability in the getRoamingCfg function of the /cgi-bin/cstecgi.cgi web management interface on TOTOLINK T6 routers running firmware 4.1.5cu.748_B20211015. It allows a remote, unauthenticated attacker to retrieve the device’s roaming enablement configuration flag. The flaw carries a CVSS v3.1 base score of 9.1 (Critical) due to its unauthenticated network exploitability, even though the disclosed data is limited to a single configuration flag.

Technical details

  • Root cause: The getRoamingCfg function within cstecgi.cgi does not enforce session/authentication checks before returning configuration data (CWE-284, Improper Access Control).
  • Trigger conditions: An attacker sends a crafted HTTP POST request containing {"topicurl":"getRoamingCfg"} to /cgi-bin/cstecgi.cgi on the device’s exposed web management interface.
  • Attack vector: Network-based, requires no authentication and no user interaction; low attack complexity.
  • Impact: Discloses the device’s roaming enablement flag to an unauthenticated remote party, resulting in a confidentiality impact; the CVE record indicates no impact to integrity or availability.

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-published patched firmware version has been confirmed for this specific CVE at time of writing; check TOTOLINK’s official download page for updated firmware for the T6 model and apply any available update.
  • If no patch is available: Restrict access to the device’s web management interface (/cgi-bin/cstecgi.cgi) to trusted internal networks only; disable remote/WAN-facing management access; place management interfaces behind a VPN or firewall ACL; monitor for unauthenticated POST requests referencing getRoamingCfg.

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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Map your entire attack surface (continously)

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Identify Potential External Exposures

Not all CVEs matter. IONIX filters vulnerabilities by asking attacker-centric questions: Can it be reached from the internet? Does it require authentication? Is it being exploited in the wild? This dramatically reduces noise and focuses teams on threats that can actually be weaponized.

4

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6

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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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