If you are using the DokuWiki Greebo release and rely on ACL checks in the include plugin, update to this release as soon as possible. Note that this is only an issue with namespace includes, so if you do not use namespace includes and edits are only allowed for users that have access to your whole wiki, this does not concern you (but updating is still recommended).
Note that this is a problem caused by a bug in DokuWiki release Greebo. A future hotfix release of DokuWiki might fix this, too, see dokuwiki/dokuwiki#2609 for further information.