Google has pushed out a new version of Chrome for Windows, macOS and Linux to patch a zero-day flaw that is being actively exploited in the wild.
The update takes Chrome to version number 88.0.4324.150. You can check where your Chrome installation is by going to Settings (the three stacked dots in the upper right corner) > Help > About Google Chrome. Opening that page will force Chrome to update if it hasn't already.
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Other browsers that share Chrome's code may not have caught up yet. At the time of this writing, Brave was still stuck on the previous version. Microsoft Edge had an update ready, but because its version-numbering scheme is different, we can't quite tell if it fixes the Chrome flaw.
The flaw has been given the catalog number CVE-2021-21148, and Google said it was "aware of reports that an exploit ... exists in the wild."
The flaw was reported to Google by an independent security researcher named Mattias Buelens on Jan. 24. That was the day before Google disclosed a North Korean espionage campaign against security researchers that used flaws in Chrome and Internet Explorer, so there may be some connection.