CVE-2026-51683 Missing authorization in n/a
Unauthenticated attackers can modify LAN network configuration on TOTOLINK T6 routers by sending a crafted POST request to the web interface.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-51683?
CVE-2026-51683 is a medium-severity missing authorization vulnerability in n/a, published on 31 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Incorrect access control in the setLanCfg function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to alter LAN network configuration via sending a crafted POST request to /cgi-bin/cstecgi.cgi.
Weakness: CWE-284
Which versions are affected by CVE-2026-51683?
How do I fix CVE-2026-51683?
No fix has been published for CVE-2026-51683 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-51683 being exploited?
There is no known exploitation of CVE-2026-51683 in the wild and no public exploit code.
Sources
Also known as GHSA-mv58-mpg3-3mmp.