Windows 10 will include a nifty little feature called Wi-Fi Sense, which shares Wi-Fi passwords with your contacts.l
While it may be useful for some, Gizmodo has discovered that the system is activated by default on the upcoming operating system.
Wi-Fi Sense already exists on Windows Phone, sending passwords of all Wi-Fi networks you have stored to Outlook.com contacts, Skype friends and Facebook friends.
The passwords are encrypted but the problem is that most people won't even know the feature is there when they upgrade.
Windows 10 does offer users the chance to decide whether they want to share their Wi-Fi passwords when connecting to a new network, but what about existing networks? Well, they will be stored on your machine when upgrading to Windows 10 and they are shared by default.
To disable them, users should go to Wi-Fi > Network settings > Manage Wi-Fi settings, and uncheck all that apply.
Windows 10 will be offered as a free upgrade to users on of Windows 7 or Windows 8 within the first year, from July 29.
To avoid overloading Microsoft's servers, not everyone eligible for the upgrade will be able to get it on the first day.
The operating system will run seamlessly across PCs, tablets, smartphones, and other hardware, but will not be on mobile devices at launch.