Critical severity9.8NVD Advisory· Published Sep 1, 2026· Updated Sep 3, 2026

CVE-2026-51757

Description

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.

Affected products

Totolink/T6llm-fuzzy
Range: 4.1.5cu.748_B20211015

Patches

Vulnerability mechanics

References

github.com/DarkBoulder/CVE-Vendor-Coordination/blob/main/TOTOLINK/README.mdnvd
github.com/ShengWu00/CVE-Vendor-Coordination/blob/main/TOTOLINK/README.mdnvd
www.totolink.netnvd
www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.htmlnvd

News mentions

Totolink T6: 25 Access Control Flaws Disclosed Together on August 31/September 1, 2026
Vypr Intelligence · Sep 1, 2026

cvss	0.637
epss	0.001
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000