Update to WordPress 5.2.3. For more information, see https://wordpress.org/news/2019/09/wordpress-5-2-3-security-and-maintenance-release/.
Pantheon release notes
WordPress 5.2.3
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Platform Robots.txt Now Allows Swiftbot
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Swiftbot can now crawl non-production environments and platform domains like test-example.pantheonsite.io to support pre-release site search testing. For details see, Bots and Indexing on Pantheon.
Pantheon Now Enforces HTTPS by Default
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This release also includes several options to control HSTS and the ability to choose a primary domain. For details see the blog announcement, Pantheon YAML documentation and our updated Launch Essentials guide.
Drupal Core Updates Available
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Drupal 8.7.7 is available to apply as a 1-click update on Pantheon site dashboards.
Documentation
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PHP 7.1, 7.2 and 7.3 Updated
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Drupal Core Updates Available
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Drupal 8.7.6 is available to apply as a 1-click update on Pantheon site dashboards.
New Relic PHP Agent Upgrade
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The New Relic agent has been upgraded Platform-wide. For more info see New Relic PHP Agent 8.7.0.242 release notes.