Open Ticket Request System (OTRS) 4.0.x before 4.0.33, 5.0.x before 5.0.31, and 6.0.x before 6.0.13 allows an authenticated user to delete files via a modified submission form because upload caching is mishandled.
https://lists.debian.org/debian-lts-announce/2018/11/msg00028.html
https://community.otrs.com/security-advisory-2018-07-security-update-for-otrs-framework/