CVE-2026-51760 Missing authorization in n/a
Unauthenticated attackers can trigger mass firmware updates on mesh slaves via crafted MQTT messages, causing service disruption.
- 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-2026-51760?
CVE-2026-51760 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 informSyncUpgfw function of TOTOLINK T6 4.1.5cu.748_B20211015 allows unauthenticated attackers to mass-trigger firmware update activity across mesh slaves via sending a crafted MQTT message to the cs_broker component.
Weakness: CWE-284
Which versions are affected by CVE-2026-51760?
How do I fix CVE-2026-51760?
No fix has been published for CVE-2026-51760 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-2026-51760 being exploited?
There is no known exploitation of CVE-2026-51760 in the wild and no public exploit code.
Sources
Also known as GHSA-4j88-2p5m-hm62.