It was found that icedtea-web though 1.7.2 and 1.8.2 did not properly sanitize paths from <jar/> elements in JNLP files. An attacker could trick a victim into running a specially crafted application and use this flaw to upload arbitrary files to arbitrary locations in the context of the user.
https://seclists.org/bugtraq/2019/Oct/5
https://lists.debian.org/debian-lts-announce/2019/09/msg00008.html
https://github.com/AdoptOpenJDK/IcedTea-Web/pull/344
https://github.com/AdoptOpenJDK/IcedTea-Web/issues/327
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10182
http://lists.opensuse.org/opensuse-security-announce/2019-08/msg00045.html