oxf/xml/xerces/XercesSAXParserFactoryImpl.java in the xforms-server component in the XForms service in Orbeon Forms before 3.9 does not properly restrict DTDs in Ajax requests, which allows remote attackers to read arbitrary files or send HTTP requests to intranet servers via an entity declaration in conjunction with an entity reference, related to an "XML injection" issue.
CWE-264