Cross-account device control via incorrect authorization in YoSmart YoLink MQTT broker
CVE-2025-59449 is an incorrect authorization vulnerability in the YoSmart/YoLink MQTT broker (reported as affecting the broker through 2025-10-02) where the broker does not enforce sufficient authorization controls to prevent cross-account access. If an attacker can obtain a target device’s YoLink device ID, the attacker can issue MQTT operations that result in remote operation/control of the victim’s devices. The advisory notes YoLink device IDs are predictable, which materially lowers the barrier to obtaining valid IDs and enables cross-account attacks at scale.
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Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
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Exploits
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No public exploit code observed for this vulnerability.
Recent activity
2 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.