The Quick Edit module does not properly check entity access in some circumstances. This could result in users with the “access in-place editing” permission viewing some content they are are not authorized to access.
Sites are only affected if the QuickEdit module (which comes with the Standard profile) is installed.
This advisory is not covered by Drupal Steward.
Install the latest version:
All versions of Drupal 9 prior to 9.2.x are end-of-life and do not receive security coverage. Note that Drupal 8 has reached its end of life.
Drupal 7 core does not include the QuickEdit module and therefore is not affected.
Uninstalling the QuickEdit module will also mitigate the vulnerability. Site owners may wish to consider this option as the QuickEdit module will be removed from core in Drupal 10.