Access Control Flaw in TOTOLINK Router Model T6
CVE-2026-51764

9.8CRITICAL

Key Information:

Vendor

TOTOLINK
Status
TOTOLINK T6
Vendor
CVE Published:
1 September 2026

What is CVE-2026-51764?

The TOTOLINK T6 router versions prior to 4.1.5cu.748_B20211015 are susceptible to an improper access control vulnerability. This issue lies within the recvSlaveCloudCheckStatus function, which fails to enforce proper authentication mechanisms. As a result, unauthorized attackers can exploit this flaw by sending specially crafted MQTT messages to the cs_broker component. This exploitation can lead to the overwriting of cloud-result tracking files, posing potential risks to system integrity and user data security.

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

.