Access Control Flaw in TOTOLINK Router Software
CVE-2026-51757

9.8CRITICAL

Key Information:

Vendor

TOTOLINK
Status
TOTOLINK T6
Vendor
CVE Published:
1 September 2026

What is CVE-2026-51757?

An access control vulnerability in the meshSlaveUpdate function of the TOTOLINK T6 version 4.1.5cu.748_B20211015 allows unauthorized users to initiate a firmware download or flash process. This exploitation occurs through the transmission of specially crafted MQTT messages directed at the cs_broker component, posing significant risks to system integrity and user data.

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

.