CVE-2025-59449
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk19th percentile - higher than 19% of all known CVEs
Summary
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.
Risk Assessment
An attacker can take control of the victim's IoT devices, such as locks, sensors, or alarm systems, potentially leading to break-ins, sabotage, or privacy breaches.
Recommendation
Update the YoLink MQTT broker to a version with authorization fixes. Implement additional authentication mechanisms and avoid relying on predictable device IDs.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS