Upgrade to Nextcloud 27
PHP8.2 is recommended over PHP8.1.
PHP8.0 is deprecated and will be removed in Nextcloud 28.
Exposed system address book
Nextcloud 27 exposes the system address book. Restrict the enumeration settings if your users should not see other users.
Web server configuration
.mjsextension, make sure to add this extension to the list of static files.