Access Control Flaw in TOTOLINK Product Leading to Unauthorized Firmware Update
CVE-2026-51760

9.8CRITICAL

Key Information:

Vendor

TOTOLINK
Status
T6
Vendor
CVE Published:
1 September 2026

What is CVE-2026-51760?

A vulnerability exists in the informSyncUpgfw function of the TOTOLINK T6 device that allows unauthenticated attackers to trigger firmware update processes across mesh slaves. This is accomplished by sending specifically crafted MQTT messages to the cs_broker component, potentially leading to unauthorized changes in the device's firmware.

References

https://www.totolink.net/home/menu/detail/menu_listtpl/do...
https://www.totolink.net/
https://github.com/DarkBoulder/CVE-Vendor-Coordination/bl...

CVSS V3.1

Score:
9.8
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.