CVE-2026-51724

Incorrect access control in the delSmartQosCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to remove Smart QoS rules via sending a crafted POST request to /cgi-bin/cstecgi.cgi.

• Published Aug 31, 2026
• CVSS 9.8 critical
• 0.6% chance of exploitation in the next 30 days (EPSS)

CVE-2026-51724 at the National Vulnerability Database