Access Control Flaw in TOTOLINK Routers Exposes Vulnerable Update Mechanism
CVE-2026-51769

9.8CRITICAL

Key Information:

Vendor

TOTOLINK
Status
TOTOLINK T6
Vendor
CVE Published:
1 September 2026

What is CVE-2026-51769?

An access control vulnerability in the remoteCloudUpdateCheck function of the TOTOLINK T6 router allows malicious actors to exploit the system. By sending specially crafted MQTT messages to the cs_broker component, attackers can trigger unauthorized restart processes for the cloud update workflow, posing significant risks to the device's security and integrity.

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

.