WordPress 4.9.4 has been pushed to all WordPress site dashboards.
Pantheon release notes
WordPress Core Upgrade
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PHP Updates
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PHP 5.6, 7.0, 7.1, and 7.2 have been updated to the latest versions platform-wide to address a vulnerability that could allow for arbitrary code execution.
Legacy SSL Add On Price Increase
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On March 5th, the cost for legacy load balancers increased from $30/month to $60/month. To avoid increased charges, upgrade to the Global CDN, which includes free, automated HTTPS, by updating DNS records.
Drupal Core Upgrades
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Drupal 8.4.5, a security release, has been pushed to all Drupal 8 site dashboards.
Drupal 7.57, a security release, has been pushed to all Drupal 7 site dashboards. This release is classified as a security release and all users are urged to upgrade their sites as soon as possible.
You can now automatically trigger Quicksilver scripts from the pantheon.upstream.yml file when you create new sites from a custom upstream.
WP-CLI Upgrades
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WP-CLI on Pantheon has been upgraded to 1.5.0, which resolves "Error: Site not found" failures often seen when clearing caches on WordPress Multisites.
WordPress Core Upgrade
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WordPress 4.9.3 has been pushed to all WordPress site dashboards.
Registry Rebuild Upgrade
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We've upgraded Registry Rebuild on Pantheon to 7.x-2.5. For details on using this Drush extension, see Drupal Drush Command-Line Utility.