ownCloud Server before 5.0.15 and 6.0.x before 6.0.2 allows remote attackers to conduct an LDAP injection attack via unspecified vectors, as demonstrated using a "login query."
https://euvd.enisa.europa.eu/vulnerability/EUVD-2014-2103
http://owncloud.org/about/security/advisories/oC-SA-2014-005/