Earlier today, it was discovered that there's a security flaw in virtually all Wi-Fi networks, that could allow attackers to spy on your network traffic, or even manipulate websites. The issue affects both WPA and WPA2 protocols, which means that if your device connects to Wi-Fi, it's probably at risk.
The good news is that companies aren't waiting around before talking about fixing it. In a statement to The Verge, Microsoft said that it has already issued a fix in the form of a security update. If you've got automatic updates enabled, you should be good to go.
The company says that it will be publishing the details of the update later on today. We still don't know the KB number of the update, which would allow you to check if you already have it. It's also unknown which versions of Windows Microsoft plans on patching. Currently, Windows 7 is in extended support, and Windows 8.1 and 10 are in mainstream support, so it's unclear if the company chose to update older versions like XP and Vista.
While Android and Linux devices should be among the worst affected, Google says that it will be releasing a fix in November's monthly security update. This means that Pixel and Nexus devices will get it first, and as always, third-party devices are a lottery.
Those third-party OEMs haven't issued statements, nor has Apple, so there will likely be more news on this later today.