Cross-site scripting (XSS) vulnerability in program/include/rcmail.php in Roundcube Webmail 1.1.x before 1.1.2 allows remote attackers to inject arbitrary web script or HTML via the _mbox parameter to the default URI.
https://roundcube.net/news/2015/06/05/updates-1.1.2-and-1.0.6-released
https://github.com/roundcube/roundcubemail/issues/4837
https://github.com/roundcube/roundcubemail/commit/b782815dacda55eee6793249b5da1789256206fc