Drupal has released security advisories to address multiple vulnerabilities in the Drupal products. The list of security updates can be found at:
Please note that Drupal 9 prior to version 9.2.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 information disclosure, security restriction bypass or tampering on an affected system.
The product vendor has released patches to address the issues.