CVE-2021-39200

WordPress is a free and open-source content management system written in
PHP and paired with a MySQL or MariaDB database. In affected versions
output data of the function wp_die() can be leaked under certain
conditions, which can include data like nonces. It can then be used to
perform actions on your behalf. This has been patched in WordPress 5.8.1,
along with any older affected versions via minor releases. It’s strongly
recommended that you keep auto-updates enabled to receive the fix.