In Apache Batik before 1.9, files lying on the filesystem of the server which uses batik can be revealed to arbitrary users who send maliciously formed SVG files. The file types that can be shown depend on the user context in which the exploitable application is running. If the user is root a full compromise of the server - including confidential or sensitive files - would be possible. XXE can also be used to attack the availability of the server via denial of service as the references within a xml document can trivially trigger an amplification attack.
https://xmlgraphics.apache.org/security.html
https://www.oracle.com/security-alerts/cpuoct2020.html
https://www.debian.org/security/2018/dsa-4215
https://access.redhat.com/errata/RHSA-2018:0319
https://access.redhat.com/errata/RHSA-2017:2547
https://access.redhat.com/errata/RHSA-2017:2546
http://www.securitytracker.com/id/1038334
http://www.securityfocus.com/bid/97948
http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
http://www.oracle.com/technetwork/security-advisory/cpujul2018-4258247.html
http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html