Access Control Flaw in TOTOLINK Router Allows Unauthorized Language Configuration Changes
CVE-2026-51668

7.5HIGH

Key Information:

Vendor

TOTOLINK
Status
T6 Router
Vendor
CVE Published:
31 August 2026

What is CVE-2026-51668?

In the TOTOLINK T6 Router version 4.1.5cu.748_B20211015, a vulnerability exists within the setLanguageCfg function that enables unauthenticated users to manipulate language settings. This flaw is exploited by sending a specially crafted POST request to the /cgi-bin/cstecgi.cgi endpoint, potentially allowing attackers to alter critical configurations without proper authorization, thereby compromising the device's intended operations.

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:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.