The volume_utils._parse_volume_info function in OpenStack Compute (Nova) before 2015.1.3 (kilo) and 12.0.x before 12.0.1 (liberty) includes the connection_info dictionary in the StorageError message when using the Xen backend, which might allow attackers to obtain sensitive password information by reading log files or other unspecified vectors.
https://security.openstack.org/ossa/OSSA-2016-002.html
https://bugs.launchpad.net/nova/+bug/1516765
http://www.securityfocus.com/bid/80189