Drupal has released a security advisory to address multiple vulnerabilities in the CKEditor library for WYSIWYG editing. A remote attacker may upload a maliciously crafted file to a vulnerable system to exploit the vulnerability.
Please note that Drupal 8 prior to version 8.9.x and Drupal 9 prior to version 9.1.x have reached End-Of-Life (EOL). No security updates will be provided after that. Users should arrange upgrading the Drupal to supported versions or migrating to other supported technology.
Successful exploitation could lead to cross site scripting on an affected system.
The product vendor has released patches to address the issues.