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It can type as you
A USB HID device can behave like a keyboard. On an unlocked machine, that means it can enter text and shortcuts as the current user.
Security awareness demo
This device was left unlocked.
An unknown USB device can act like a keyboard. If the device is unlocked, it can type commands, open applications, and act as the signed-in user.
This demo is harmless. The lesson is simple:
lock your screen before walking away.
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Your session is active
Email, files, browsers, cloud apps and internal tools may already be open or signed in. Physical access becomes digital access.
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Speed changes the risk
What a person could type manually, a device can type quickly and repeatedly. The safest control is to lock the device first.
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The control
Before leaving your desk, meeting room, train seat or shared workspace, lock the screen. It takes less than a second.
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Remember
The device is not magic. The risk exists because the device was left unlocked and trusted input from a connected USB keyboard.