Improper authorization in Nextcloud server 17.0.0 causes leaking of previews and files when a file-drop share link is opened via the gallery app.Referenceshttps://hackerone.com/reports/719426https://nextcloud.com/security/advisory/?id=NC-SA-2019-012http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00019.htmlhttp://lists.opensuse.org/opensuse-security-announce/2020-02/msg00022.html
