Insufficient policy enforcement in File System API in Google Chrome prior to 88.0.4324.96 allowed a remote attacker to bypass file extension policy via a crafted HTML page.
https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2021-21141
https://chromereleases.googleblog.com/2021/01/stable-channel-update-for-desktop_19.html