How about the Win10 system?

On July 29, Microsoft officially released Windows10, a new generation operating system. The British "Daily Mail" website reported on July 29 that the Windows 10 Wi-Fi Sense feature may pose a major security risk: this feature will share the Wi-Fi network password with the user's contacts. Therefore, after a password is granted to a person, everyone who knows it will gain access.

It is reported that Microsoft's newly released Windows 10 system comes with a feature called Wi-Fi Sense, which will be automatically installed on the user's computer when the user installs or upgrades Windows 10. The Krebs on Security blogger said it was a “premeditated accident”.
Microsoft said that Wi-Fi Sense can automatically connect the user's network to nearby WiFi to save users' cellular data, and also provide users with more network options.
Wi-Fi Sense does not display passwords to family, friends, or acquaintances, but allows them to use the relevant Wi-Fi network if they meet the conditions. These passwords are stored on Microsoft's servers and are sent to the appropriate device when the conditions are met. However, Microsoft did not show you these passwords.
Microsoft wrote in the FAQ section of Wi-Fi Sense: "When you want to share access to a network, the password will be sent to Microsoft via an encrypted connection and stored as an encrypted file on the Microsoft server. in. Later, when your friend uses Wi-Fi Sense and is within the coverage of the Wi-Fi network, the system sends it to your contact's phone via an encrypted connection. "The Daily Mail" said that this sounds pretty good, but we can't know what the actual implementation will be: if the computer is connected to a password-protected WiFi network, you must know the password. If the computer knows the password, A malicious user or hacker will be able to find the password and gain full access.
The new generation operating system Windows 10 was officially released on the 29th. It is reported that Microsoft will push the official version of Windows 10 installation package to global users including China. Win7, Win8 genuine users can upgrade free of charge. Windows 10 has improved some of the inconveniences of the win8 system, including the familiar start menu and the “old” recycle bin, which will be launched first on laptops and tablets.