Language: Java
Label: vulnerable
CWE: CWE-611 \u2014 Improper Restriction of XML External Entity Reference
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Code:
	public static String encodeMapIntoMemento(Map<String, String> keyPairValues) {
		String returnValue = null;

		DocumentBuilderFactory dfactory = DocumentBuilderFactory.newInstance();
		DocumentBuilder docBuilder = null;
		try {
			docBuilder = dfactory.newDocumentBuilder();
			Document doc = docBuilder.newDocument();

			Element rootElement = doc.createElement(ROOT_ELEMENT_TAGNAME);
			doc.appendChild(rootElement);
			// create one XML element per map entry
			for (String key : keyPairValues.keySet()) {
				Element elem = doc.createElement(ELEMENT_TAGNAME);
				// store key and value as values of 2 attributes
				elem.setAttribute(ATTRIBUTE_KEY, key);
				elem.setAttribute(ATTRIBUTE_VALUE, keyPairValues.get(key));
				rootElement.appendChild(elem);
			}

			ByteArrayOutputStream s = new ByteArrayOutputStream();

			TransformerFactory factory = TransformerFactory.newInstance();
			Transformer transformer = factory.newTransformer();
			transformer.setOutputProperty(OutputKeys.METHOD, "xml"); //$NON-NLS-1$
			transformer.setOutputProperty(OutputKeys.INDENT, "yes"); //$NON-NLS-1$

			DOMSource source = new DOMSource(doc);
			StreamResult outputTarget = new StreamResult(s);
			transformer.transform(source, outputTarget);

			returnValue = s.toString("UTF8"); //$NON-NLS-1$
		} catch (Exception e) {
			e.printStackTrace();
		}
		return returnValue;
	}