The UpdateRequestHandler for XML in Apache Solr before 4.1 allows remote attackers to have an unspecified impact via XML data containing an external entity declaration in conjunction with an entity reference, related to an XML External Entity (XXE) issue.
rhn.redhat.com/errata/RHSA-2013-1844.html
rhn.redhat.com/errata/RHSA-2014-0029.html
secunia.com/advisories/55542
secunia.com/advisories/59372
svn.apache.org/viewvc/lucene/dev/branches/branch_4x/solr/CHANGES.txt?view=markup
www.openwall.com/lists/oss-security/2013/11/29/2
issues.apache.org/jira/browse/SOLR-3895