CVE-2026-51770

Incorrect access control in the sendToMasterQosConfig function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to forward attacker-controlled QoS settings to the master via sending a crafted MQTT message to the cs_broker component..

• Published Sep 1, 2026
• CVSS 9.8 critical
• 0.6% chance of exploitation in the next 30 days (EPSS)

CVE-2026-51770 at the National Vulnerability Database