Dino before 2019-09-10 does not properly check the source of an MAM message in module/xep/0313_message_archive_management.vala.
https://www.debian.org/security/2019/dsa-4524
https://usn.ubuntu.com/4306-1/
https://seclists.org/bugtraq/2019/Sep/31
https://gultsch.de/dino_multiple.html
https://github.com/dino/dino/commit/307f16cc86dd2b95aa02ab8a85110e4a2d5e7363