The fake message from Wordpress says the WP security team discovered a remote code execution flaw in your site, and that Wordpress has made available a patch for the flaw - CVE-2023-45124 -- which doesn't exist. The "patch" is actually a website backdoor.
https://media.infosec.exchange/infosec.exchange/media_attachments/files/111/522/256/557/597/447/original/455a08d6dde9631f.png