In mxGraphViewImageReader.java in mxGraph before 3.7.6, the SAXParserFactory instance in convert() is missing flags to prevent XML External Entity (XXE) attacks, as demonstrated by /ServerView.
https://github.com/advisories/GHSA-wvpv-8524-wg6x
https://lists.debian.org/debian-lts-announce/2018/03/msg00002.html