CVE-2026-51770 Missing authorization in n/a
Unauthenticated attackers can modify QoS settings on TOTOLINK T6 routers by sending crafted MQTT messages due to missing access controls.
- 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-2026-51770?
CVE-2026-51770 is a critical 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 sendToMasterQosConfig function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to forward attacker-controlled QoS settings to the master via sending a crafted MQTT message to the cs_broker component..
Weakness: CWE-284
Which versions are affected by CVE-2026-51770?
How do I fix CVE-2026-51770?
No fix has been published for CVE-2026-51770 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-2026-51770 being exploited?
There is no known exploitation of CVE-2026-51770 in the wild and no public exploit code.
Sources
Also known as GHSA-c6w3-3vcp-m3h3.