Drupal SA-CORE-2018-002 - Highly critical - Remote Code Execution vulnerability

Late last week, the Drupal Security Team announced a "Highly critical" remote code execution vulnerability that affects Drupal 6 (EOL), Drupal 7 and Drupal 8. SA-CORE-2018-002 dubbed "Drupalgeddon2" was discovered by Jasper Mattsson. Drupal scores it a whopping 21 (out of a possible 25) "Security Risk Level". All users are recommended to update their Drupal sites immediately.