Description
Drupal Core is prone to multiple vulnerabilities, including cross-site scripting and security bypass vulnerabilities. Exploiting these issues could allow an attacker to execute arbitrary script code in the browser of an unsuspecting user in the context of the affected site, allowing the attacker to steal cookie-based authentication credentials, or to perform otherwise restricted actions and subsequently view content and comments, add comments, or update certain data. Drupal Core versions 8.x ranging from 8.0.0 and up to and including 8.4.4 are vulnerable.
Remediation
Update to Drupal Core version 8.4.5 or latest