Index: trunk/src/org/openstreetmap/josm/tools/XmlUtils.java
===================================================================
--- trunk/src/org/openstreetmap/josm/tools/XmlUtils.java	(revision 16559)
+++ trunk/src/org/openstreetmap/josm/tools/XmlUtils.java	(revision 16560)
@@ -35,4 +35,6 @@
  */
 public final class XmlUtils {
+
+    private static final String FEATURE_DISALLOW_DOCTYPE_DECL = "http://apache.org/xml/features/disallow-doctype-decl";
 
     private XmlUtils() {
@@ -101,4 +103,5 @@
         SAXParserFactory parserFactory = SAXParserFactory.newInstance();
         parserFactory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true);
+        parserFactory.setFeature(FEATURE_DISALLOW_DOCTYPE_DECL, true);
         parserFactory.setNamespaceAware(true);
         return parserFactory.newSAXParser();