The /webtools/control/xmlrpc endpoint in OFBiz XML-RPC event handler is exposed to External Entity Injection by passing DOCTYPE declarations with executable payloads that discloses the contents of files in the filesystem. In addition, it can also be used to probe for open network ports, and figure out from returned error messages whether a file exists or not. This affects OFBiz 16.11.01 to 16.11.04.

In Apache OFBiz 16.11.01 to 16.11.04, the OFBiz HTTP engine (org.apache.ofbiz.service.engine.HttpEngine.java) handles requests for HTTP services via the /webtools/control/httpService endpoint. Both POST and GET requests to the httpService endpoint may contain three parameters: serviceName, serviceMode, and serviceContext. The exploitation occurs by having DOCTYPEs pointing to external references that trigger a payload that returns secret information from the host.