The packaging of NextCloud in openSUSE used /srv/www/htdocs in an unsafe manner, which could have allowed scripts running as wwwrun user to escalate privileges to root during nextcloud package upgrade.
https://www.suse.com/de-de/security/cve/CVE-2017-9286/
https://lists.opensuse.org/opensuse-updates/2017-10/msg00010.html