CVE-2026-51761 Missing authorization in n/a
Unauthenticated attackers can modify LAN address state by sending crafted MQTT messages to the TOTOLINK T6 router's broker component.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-51761?
CVE-2026-51761 is a medium-severity missing authorization vulnerability in n/a, published on 1 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Incorrect access control in the updateLanIp function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to refresh the LAN address state via sending a crafted MQTT message to the cs_broker component.
Weakness: CWE-284
Which versions are affected by CVE-2026-51761?
How do I fix CVE-2026-51761?
No fix has been published for CVE-2026-51761 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-2026-51761 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-51761 exists.
Sources
Also known as GHSA-wpv7-68x4-3w6h.