Oracle Java SE / JRE contains a flaw in the Deployment subcomponent. The issue is triggered when a JNLP file requests <all-permissions/> while referencing trusted JAR files. With a specially crafted JNLP file, a context-dependent attacker can manipulate system properties and execute arbitrary code.
Currently, there are no known workarounds or upgrades to correct this issue. However, Oracle has released a patch to address this vulnerability. Check the vendor advisory in the references section.