Insufficient policy enforcement in extensions in Google Chrome prior to 90.0.4430.93 allowed an attacker who convinced a user to install a malicious extension to bypass navigation restrictions via a crafted Chrome Extension.
https://www.debian.org/security/2021/dsa-4911
https://security.gentoo.org/glsa/202104-08
https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop_26.html