Version 2.10.1 of Apache Jackrabbit fixes XXE/XEE issue in the jackrabbit-webdav module.
Part of original advisory:
"""
When processing a WebDAV request body containing XML, the XML parser can be
instructed to read content from network resources accessible to the host,
identified by URI schemes such as "http(s)" or  "file". Depending on the
WebDAV request, this can not only be used to trigger internal network
requests, but might also be used to insert said content into the request,
potentially exposing it to the attacker and others (for instance, by inserting
said content in a WebDAV property value using a PROPPATCH request). See also
IETF RFC 4918, Section 20.6.
"""

Original report: http://seclists.org/bugtraq/2015/May/124
Upstream bug with patches: https://issues.apache.org/jira/browse/JCR-3883