Resolved - Drupal.org has released Drupal version 7.66. This release is classified as a security release for all previous versions of Drupal.[1] Pantheon has made the update available for one-click update in site dashboards. We urge all users to update all environments as soon as possible. Instructions for applying core updates can be found in our Support Center.[2] This release addresses SA-CORE-2019-006[3]; all users are urged to upgrade their sites as soon as possible.

[1] - https://www.drupal.org/project/drupal/releases/7.66
[2] - https://pantheon.io/docs/upstream-updates/
[3] - https://www.drupal.org/sa-core-2019-006
Apr 17, 14:52 PDT

Resolved - Drupal.org has released Drupal version 8.6.15. This release is classified as a security release for all previous versions of Drupal.[1] Pantheon has made the update available for one-click update in site dashboards. We urge all users to update all environments as soon as possible. Instructions for applying core updates can be found in our Support Center.[2] This release addresses SA-CORE-2019-006[3]; all users are urged to upgrade their sites as soon as possible.

[1] - https://www.drupal.org/project/drupal/releases/8.6.15
[2] - https://pantheon.io/docs/upstream-updates/
[3] - https://www.drupal.org/sa-core-2019-006
Apr 17, 14:31 PDT