CVE-2026-51760

critical

Description

Incorrect access control in the informSyncUpgfw function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to mass-trigger firmware update activity across mesh slaves via sending a crafted MQTT message to the cs_broker component.

References

https://www.totolink.net/home/menu/detail/menu_listtpl/download/id/190/ids/36.html

https://www.totolink.net/

https://github.com/ShengWu00/CVE-Vendor-Coordination/blob/main/TOTOLINK/README.md

https://github.com/DarkBoulder/CVE-Vendor-Coordination/blob/main/TOTOLINK/README.md

Details

Source: Mitre, NVD

Published: 2026-09-01

Updated: 2026-09-03

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 9.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H