When running in prototype mode, the h2 webconsole module (accessible from the Prototype menu) is automatically made available with the ability to directly query the database. It was felt that it is safer to require the developer to explicitly enable this capability. As of 2.0.0-M8, this can now be done using the 'isis.prototyping.h2-console.web-allow-remote-access' configuration property
CWE-306: Missing Authentication for Critical Function