In Xfce xfce4-settings before 4.16.4 and 4.17.x before 4.17.1, there is an argument injection vulnerability in xfce4-mime-helper.
Xfce Thunar 1.6.15, when Xfce 4.12 is used, mishandles the IBus-Unikey input method for file searches within File Manager, leading to an out-of-bounds read and SEGV. This could potentially be exploited by an arbitrary local user who creates files in /tmp before the victim uses this input method.