CVE-2025-59449 Missing authorization in YoLink MQTT broker
Attackers can remotely control other users' YoLink devices by exploiting predictable IDs and missing authorization checks in the MQTT broker.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-59449?
CVE-2025-59449 is a medium-severity missing authorization vulnerability in YoSmart YoLink MQTT broker, published on 6 Oct 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
The YoSmart YoLink MQTT broker through 2025-10-02 does not enforce sufficient authorization controls to prevent cross-account attacks, allowing an attacker to remotely operate affected devices if the attacker obtains the associated device IDs. Because YoLink device IDs are predictable, an attacker can exploit this to gain full control over any other YoLink user's devices.
Weakness: CWE-863
Which versions are affected by CVE-2025-59449?
How do I fix CVE-2025-59449?
No fix has been published for CVE-2025-59449 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-2025-59449 being exploited?
There is no known exploitation of CVE-2025-59449 in the wild and no public exploit code.
Sources
Also known as GHSA-mrg6-25pv-x3g8.