user_entity_reference_selection
No security coverage
This module provides a node entity reference selection handler that extends the default behavior to have access checks run against a fixed user rather than the current. It was built to allow admins to populate public-facing entity reference fields without fear of including inaccessible content.
Installation
Install as you would normally install a contributed Drupal module. See: https://www.drupal.org/node/895232 for further information.
Configuration
When configuring the entity reference field, choose the Default with fixed user access reference method. As well as the usual configuration options, there is an additional field User to run as. Enter the user to have access checks run as. Be careful if choosing an authenticated user: there are security implications.