Insufficient validation of untrusted input in Mojo in Google Chrome prior to 90.0.4430.72 allowed a remote attacker who had compromised the renderer process to leak cross-origin data via a crafted HTML page.
https://www.debian.org/security/2021/dsa-4906
https://security.gentoo.org/glsa/202104-08
https://chromereleases.googleblog.com/2021/04/stable-channel-update-for-desktop_14.html