SmartThings Arrival Sensor accidentally unlock all my doors at 1 a.m

[JDRoberts]

This can happen with any single presence method that you use with SmartThings. The Usual solution is to require that two things show that you are away before you are actually marked as away. See the following discussion thread

Extremely Scary Bug! (Lost internet causes away/arrival sequence to fire)

Hi all, I woke up today to a notification saying SmartThings had unlocked my connected door lock at ~3:55am. After momentarily panicking and checking the house, I came to realize what had happened. Somehow, either the internet had gone offline, my router had restarted, or the SmartThings hub itself had. Whenever it came back online, it ‘detected’ the presence of my SmartThings arrival sensor and unlocked the door per my automation rule. I’m still investigating, but if it was the internet, this means that all somebody has to do is unplug your uplink to the internet and plug it back in (often the ISP cables are just sitting outside your house), and if you have an arrival sensor, the door would unlock. Similarly, if it was the router/hub, if an attacker can temporarily cut your power, they …