ownCloud Server before 5.0.19, 6.x before 6.0.7, and 7.x before 7.0.5 allows remote authenticated users to bypass the file blacklist and upload arbitrary files via a file path with UTF-8 encoding, as demonstrated by uploading a .htaccess file.
Debian Linux Security Advisory 3244-1 - Multiple vulnerabilities were discovered in ownCloud, a cloud storage web service for files, music, contacts, calendars and many more.