CVE-2026-51669: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the getPairCfg function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to obtain pairing and mesh-slave configuration via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Affected Software
1 affected component
TOTOLINK T6=4.1.5cu.748_B20211015
Event History
Aug 31, 2026
CVE Published
via MITRE·12:00 AM
Data Sourced
via MITRE·12:00 AM
Description
Data Sourced
via NVD·02:17 PM
Description
Frequently Asked Questions
1
Who can exploit this issue?
An unauthenticated attacker able to send a crafted POST request to the router's /cgi-bin/cstecgi.cgi endpoint can exploit it. No valid login credentials are required.
2
What information could be exposed?
The affected getPairCfg function can disclose pairing and mesh-slave configuration information.
3
How can I determine whether a device is affected?
The reported affected product and firmware version are TOTOLINK T6 running 4.1.5cu.748_B20211015. Exposure also requires that an attacker can reach the device's web interface endpoint.