CVE-2026-51690

Critical severity, CVSS 9.1. EPSS: 0.5% chance of exploitation in the next 30 days.

Incorrect access control in the setWanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter upstream provisioning and connectivity via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

Published 2026-08-31. Last modified 2026-09-02.