Under some circumstances, the Drupal core JSON:API module does not properly restrict access to certain content, which may result in unintended access bypass.

Sites that do not have the JSON:API module enabled are not affected.

This advisory is not covered by Drupal Steward.

The QuickEdit module does not properly check access to fields in some circumstances, which can lead to unintended disclosure of field data.

Sites are only affected if the QuickEdit module (which comes with the Standard profile) is installed.

This advisory is not covered by Drupal Steward.

Drupal’s JSON:API and REST/File modules allow file uploads through their HTTP APIs. The modules do not correctly run all file validation, which causes an access bypass vulnerability. An attacker might be able to upload files that bypass the file validation process implemented by modules on the site.

This vulnerability is mitigated by three factors:

The JSON:API or REST File upload modules must be enabled on the site.
An attacker must have access to a file upload via JSON:API or REST.
The site must employ a file validation module.

This advisory is not covered by Drupal Steward.

Also see GraphQL – Moderately critical – Access bypass – SA-CONTRIB-2021-029 which addresses a similar vulnerability for that module.