CVE-2026-51757

Critical severity, CVSS 9.8. EPSS: 0.6% chance of exploitation in the next 30 days.

Incorrect access control in the meshSlaveUpdate function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to start a firmware download or flash workflow on the slave device via sending a crafted MQTT message to the cs_broker component.

Published 2026-09-01. Last modified 2026-09-03.