CVE-2026-51757 Missing authorization in n/a
Unauthenticated attackers can trigger firmware updates on slave devices via crafted MQTT messages, potentially leading to code execution or privilege escalation.
- 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-2026-51757?
CVE-2026-51757 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 meshSlaveUpdate function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to start a firmware download or flash workflow on the slave device via sending a crafted MQTT message to the cs_broker component.
Weakness: CWE-284
Which versions are affected by CVE-2026-51757?
How do I fix CVE-2026-51757?
No fix has been published for CVE-2026-51757 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-2026-51757 being exploited?
There is no known exploitation of CVE-2026-51757 in the wild and no public exploit code.
Sources
Also known as GHSA-9qxh-35cv-gh5r.