Drupal 8.9.17 Security Update
Incident Report for Pantheon Operations
Drupal.org has released Drupal version 8.9.17. 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-2021-004[3]; all users are urged to upgrade their sites as soon as possible.

[1] - https://www.drupal.org/project/drupal/releases/8.9.17
[2] - https://pantheon.io/docs/upstream-updates/
[3] - https://www.drupal.org/sa-core-2021-004
Posted Jul 21, 2021 - 11:48 PDT