CVE-2026-51696: TOTOLINK T6 vulnerability
Published Aug 31, 2026
·Updated
Incorrect access control in the setPortForwardRules function of TOTOLINK T6 4.1.5cu.748B20211015 allows unauthenticated attackers to expose internal services 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
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. The issue affects the setPortForwardRules function in the specified TOTOLINK T6 firmware.
2
What is the impact of successful exploitation?
An attacker can create port-forwarding rules that expose internal services. This may make services on the internal network reachable through the affected device.