CVE-2026-51690: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the setWanCfg function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to alter upstream provisioning and connectivity 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
Frequently Asked Questions
1
Which devices are affected?
The affected product and version identified in the available data is TOTOLINK T6 firmware 4.1.5cu.748_B20211015.
2
Does exploitation require authentication?
No. An unauthenticated attacker can exploit the issue by sending a crafted POST request to /cgi-bin/cstecgi.cgi.
3
What could an attacker change?
An attacker can alter upstream provisioning and connectivity through the setWanCfg function.