A maliciously crafted command line for kdesu can result in the user only seeing part of the commands that will actually get executed as super user.
http://www.securityfocus.com/bid/93224
http://www.openwall.com/lists/oss-security/2016/09/29/7
http://lists.opensuse.org/opensuse-updates/2016-10/msg00034.html
http://lists.opensuse.org/opensuse-updates/2016-10/msg00031.html