Absolute path traversal vulnerability in program/steps/addressbook/photo.inc in Roundcube before 1.0.6 and 1.1.x before 1.1.2 allows remote authenticated users to read arbitrary files via a full pathname in the _alt parameter, related to contact photo handling.
https://roundcube.net/news/2015/06/05/updates-1.1.2-and-1.0.6-released/
http://trac.roundcube.net/ticket/1490379