CVE-2026-54640

Summary The fix for CVE-2026-40882 addressed only the Velbus asset import handler. The KNX asset import handler (KNXProtocol) processes user-uploaded ETS project ZIP files through Saxon XSLT and XMLInputFactory.newInstance() with no XXE protection, allowing any authenticated user to read arbitrary files from the server filesystem (e.g. /etc/passwd, openmrs-runtime.properties, cloud credential files). Details Incomplete patch CVE-2026-40882 was fixed by introducing createSecureDocumentBuilderFactory() in AbstractVelbusProtocol.java with five XXE-blocking features. The parallel asset import handler in KNXProtocol.java was not updated and retains two unprotected XML parsing calls on the same user-controlled data. Patched file — AbstractVelbusProtocol.java: private DocumentBuilderFactory createSecureDocumentBuilderFactory() { DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, true); factory.setFeature("http://apache.org/xml/features/disallow-doctype-decl", true); factory.setFeature("http://xml.org/sax/features/external-general-entities", false); factory.setFeature("http://xml.org/sax/features/external-parameter-entities", false); factory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false); return factory; } Vulnerable file — KNXProtocol.java, lines 229–249: // Line 229-230: reads 0.xml from user-uploaded ZIP InputStream inputStream = KNXProtocol.class.getResourceAsStream(".../ets_calimero_group_name.xsl"); String xsd = IOUtils.toString(inputStream, StandardCharsets.UTF_8); // Lines 233-245: Saxon XSLT — no XXE protection on the source document TransformerFactory tfactory = new TransformerFactoryImpl(); Transformer transformer = tfactory.newTransformer(new StreamSource(new StringReader(xsd))); transformer.transform( new StreamSource(new StringReader(xml)), // xml = 0.xm

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