OTRS 3.1.x before 3.1.21, 3.2.x before 3.2.16, and 3.3.x before 3.3.6 allows remote attackers to conduct clickjacking attacks via an IFRAME element.
http://www.otrs.com/security-advisory-2014-05-clickjacking-issue/
http://lists.opensuse.org/opensuse-updates/2014-04/msg00062.html