Pantheon release notes

The Pantheon MU Plugin v1.5.6 is now available.

WordPress sites can apply this update by applying upstream updates from the dashboard or via Terminus. WordPress (composer managed) sites can upgrade using composer update or by checking for updates in the dashboard.

Revised MU Plugin update strategy

Starting with this release, MU Plugin updates are deployed as standalone commits to the WordPress upstream, independent of WordPress core version updates. WordPress sites will now receive MU Plugin updates more frequently and as discrete, visible changes in the dashboard — rather than bundled with core version bumps.

What's new?

This release spans two MU Plugin versions, with updates concerning WordPress sites running Elasticsearch on Pantheon:

1.5.5

• Fixes an issue where wp elasticpress sync CLI commands indexed content with http:// image URLs instead of https://, causing broken images on the HTTPS frontend. A pantheon_elasticpress_force_https_in_cli filter is available for sites that need to opt out of this behavior.

1.5.6

• Fixes ElasticPress Autosuggest and Instant Results on sites using ElasticPress.io by routing browser-side search requests to the public host rather than an internal proxy URL that browsers cannot reach.

WordPress upstream

• WP_HOME and WP_SITEURL definitions in wp-config-pantheon.php are now conditional, so customer-defined values are respected and PHP notices are no longer generated when these constants are already set before wp-config-pantheon.php is included.

Pantheon has released version 2.3.1 of the WP SAML Auth WordPress plugin. This update adds a new filter for multisite environments to give developers more control over how SAML-provisioned users are added to sites. No action is required — existing behavior is unchanged.

What's new

• Multisite user provisioning control — A new wp_saml_auth_auto_add_to_blog filter allows developers to prevent auto-provisioned SAML users from being automatically added to the current site. When set to false, users are created as network-level users without a role on any specific site, giving full control over site membership. The filter defaults to true, preserving existing behavior. See #465 for details.

Update to 2.3.1 from the WordPress dashboard under Plugins > Installed Plugins, or download it from the WordPress Plugin Repository.

For more details, see the plugin changelog.

Version 1.3.5 of the Pantheon Content Publisher WordPress plugin is now available.

What's new?

• ACF integration — Sync Content Publisher metadata fields to Advanced Custom Fields. Define field mappings per post type in the plugin's Integration tab and metadata values are automatically applied on every publish.
• Custom post type support — Publish content to any public post type registered on your WordPress site. Administrators can set the target post type per collection, or select "Chosen by the author" to let document authors control it via the wp-post-type metadata field.

Update to 1.3.5 from the WordPress dashboard under Plugins > Installed Plugins, or download it from the WordPress Plugin Repository.

For more details, see the plugin changelog.

We are pleased to announce that all of our actively maintained WordPress plugins are now confirmed fully compatible with WordPress 6.9.

Actively Maintained Plugins

The following plugins have been tested and verified for compatibility:

• WP SAML Auth
• Pantheon Advanced Page Cache
• Pantheon HUD
• Native PHP Sessions
• Pantheon Content Publisher
• WP Redis

Action Required

We recommend updating your Pantheon plugins to their latest versions alongside your WordPress 6.9 core upgrade. This ensures you receive the latest performance optimizations, security patches, and full compatibility with PHP 8.4.

As a best practice, always test these updates in a Dev or Multidev environment before deploying to Live.

The Pantheon Content Publisher plugin is now officially available in the WordPress Plugin Repository. You can now install or update it directly from your WordPress dashboard.

Action required

We recommend that all customers switch their sites to the WordPress.org–hosted version to take advantage of seamless updates and improved long-term support. By switching, you’ll:

• Receive automatic update notifications and one-click upgrades within the WordPress admin panel
• Stay up to date with the latest security, stability, and compatibility improvements
• Benefit from WordPress’s official distribution system, including built-in changelogs, and version tracking

Switching to the repository version helps ensure your site runs the most stable and officially supported release of the plugin.

Pantheon has released a new version of our Native PHP Sessions plugin. This release updates documentation and a number of minor dependencies under the hood. Most notably, this update tests the plugin against PHP 8.4, increases the minimum PHP version to 7.4 and bumps the minimum supported WordPress version to 5.3. Additionally, to comply with WordPress plugin repository guidelines, we have removed "WordPress" from the plugin name.

Action required

You are encouraged to upgrade your version of Native PHP Sessions to the latest version as soon as you are able.

If you have issues with the plugin, please use the GitHub issue queue for the plugin.

All WordPress plugins and Drupal modules actively maintained by Pantheon have been confirmed to be compatible with PHP 8.4. Most did not require any code updates to be compatible, so they did not receive a version bump.

• Pantheon Advanced Page Cache (WordPress)
• Pantheon WordPress mu-plugin
• WP Redis
• WP Native PHP Sessions
• WP SAML Auth
• Pantheon HUD
• Search API Pantheon
• Pantheon Advanced Page Cache (Drupal)
• Pantheon Content Publisher (Drupal)

PHP 8.4 is now available on the Pantheon platform. Learn more about the release.

The Pantheon MU Plugin v1.5.3 update is now available for Composer-based WordPress sites. For non-Composer-based WordPress sites, this latest update will be bundled with the next WordPress core update (likely 6.8, expected April 15.). WordPress (composer managed) sites can upgrade today using composer update or by checking for updates in the dashboard.

What's new?

The 1.5.3 update includes a number of minor bug fixes and enhancements:

• Updates all links to the Plugins with Known Issues documentation page to the updated WordPress Known Issues page to match the update to the docs site.
• Fixes a PHP warning on the Site Health page. (props to Weston Ruter for the report.)
• Fixes an issue in the compatibility layer that was causing the WP Rocket plugin to throw a fatal error on deactivation.
• Updates the compatibility layer to define constants earlier in WordPress execution. Previously, the constants were defined on plugins_loaded which may be too late to override those constants set by the plugins themselves. (props to Rachel Backert for the report.)