The virtual filesystem in ownCloud Server before 6.0.9, 7.0.x before 7.0.7, and 8.0.x before 8.0.5 does not consider that NULL is a valid getPath return value, which allows remote authenticated users to bypass intended access restrictions and gain access to users files via a sharing link to a file with a deleted parent folder.
Directory traversal vulnerability in the routing component in ownCloud Server before 7.0.6 and 8.0.x before 8.0.4, when running on Windows, allows remote attackers to reinstall the application or execute arbitrary code via unspecified vectors.
Cross-site scripting (XSS) vulnerability in the activity application in ownCloud Server before 7.0.5 and 8.0.x before 8.0.4 allows remote authenticated users to inject arbitrary web script or HTML via a " (double quote) character in a filename in a shared folder.