Drupal has released security updates to address a vulnerability in Drupal Core. It is recommended that you take the necessary precautions by ensuring your products are always updated.
The Guyana National CIRT recommends that users and administration review these updates and apply them where necessary.
Reference
Drupal Release Security Updates (US-Cert)
https://www.us-cert.gov/ncas/current-activity/2019/04/17/Drupal-Releases-Security-Updates