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Vulnerability of Drupal Core: privilege escalation via JSON-API PATCH Requests

Synthesis of the vulnerability 

An attacker can bypass restrictions via JSON:API PATCH Requests of Drupal Core, in order to escalate his privileges.
Vulnerable systems: Drupal Core, IBM API Connect.
Severity of this threat: 2/4.
Creation date: 18/06/2020.
Références of this weakness: 6240310, CERTFR-2020-AVI-381, CVE-2020-13665, DRUPAL-SA-CORE-2020-006, VIGILANCE-VUL-32570.

Description of the vulnerability 

An attacker can bypass restrictions via JSON:API PATCH Requests of Drupal Core, in order to escalate his privileges.
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This threat announce impacts software or systems such as Drupal Core, IBM API Connect.

Our Vigil@nce team determined that the severity of this cybersecurity alert is medium.

The trust level is of type confirmed by the editor, with an origin of user account.

An attacker with a expert ability can exploit this security alert.

Solutions for this threat 

Drupal Core: version 9.0.1.
The version 9.0.1 is fixed:
  https://www.drupal.org/project/drupal/releases/9.0.1

Drupal Core: version 8.9.1.
The version 8.9.1 is fixed:
  https://www.drupal.org/project/drupal/releases/8.9.1

Drupal Core: version 8.8.8.
The version 8.8.8 is fixed:
  https://www.drupal.org/project/drupal/releases/8.8.8

IBM API Connect: patch for Drupal.
A patch is indicated in information sources.
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Computer vulnerabilities tracking service 

Vigil@nce provides a systems vulnerabilities alert. The Vigil@nce security watch publishes vulnerability bulletins about threats impacting the information system.