There are 2,100 vulnerabilities in Windows 10, including some that could enable an attacker to take control of a computer.
This is the second major release of Windows 10 since Microsoft released it in April.
The previous one was a Windows 10 preview released in late March and was not officially released until early April.
The new release is also not officially supported by Microsoft and is currently in testing.
Microsoft’s release notes are not available online but the company has released a detailed list of known vulnerabilities that can be exploited.
We’ve also analysed the security patch for Windows 10 to find out what changes have been made to it in this latest version.