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Vulnerability of Drupal Core: Cross Site Scripting via Date Format Configuration

Synthesis of the vulnerability 

An attacker can trigger a Cross Site Scripting via Date Format Configuration of Drupal Core, in order to run JavaScript code in the context of the web site.
Vulnerable software: Drupal Core.
Severity of this announce: 2/4.
Creation date: 04/09/2019.
Références of this computer vulnerability: VIGILANCE-VUL-30241.

Description of the vulnerability 

The Core module can be installed on Drupal.

However, it does not filter received data via Date Format Configuration before inserting them in generated HTML documents.

An attacker can therefore trigger a Cross Site Scripting via Date Format Configuration of Drupal Core, in order to run JavaScript code in the context of the web site.
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This cybersecurity alert impacts software or systems such as Drupal Core.

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

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

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

Solutions for this threat 

Drupal Core: version 8.7.7.
The version 8.7.7 is fixed:
  https://www.drupal.org/download
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