CVE-2026-51747

Incorrect access control in the keepAlive function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to emit indirect mesh heartbeat information toward 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-2026-51747 at the National Vulnerability Database