FreePlane version 1.5.9 and earlier contains a XML External Entity (XXE) vulnerability in XML Parser in mindmap loader that can result in stealing data from victim's machine. This attack appears to require the victim to open a specially crafted mind map file. This vulnerability appears to have been fixed in 1.6+.
https://www.youtube.com/watch?v=7IXtiTNilAI
https://www.freeplane.org/wiki/index.php/XML_External_Entity_vulnerability_in_map_parser
https://www.debian.org/security/2018/dsa-4175
https://lists.debian.org/debian-lts-announce/2018/03/msg00019.html