Drupal 8 before 8.2.8 and 8.3 before 8.3.1 allows critical access bypass by authenticated users if the RESTful Web Services (rest) module is enabled and the site allows PATCH requests.
https://www.drupal.org/SA-CORE-2017-002
https://euvd.enisa.europa.eu/vulnerability/EUVD-2022-2803