Release date: Jun 1, 2026

• Improve performance by preloading core plugin classes and skipping dynamic content tag parsing when no tags are present.
• Improve security for admin AJAX requests by adding a nonce check and stricter audience ID handling.
• Improve dynamic content tag replacement by removing broken regular expressions.
• Improve form preview output by disabling PHP error display during preview rendering.
• Update JavaScript dependencies and pass admin script data using wp_add_inline_script().

= 4.12.6 =

Release date: May 26, 2026

• Fix integrations losing runtime options like double opt-in when sign-up attempts are processed asynchronously. Thanks Jon Parker!
• Fix Site Tracking Pixel setting not being saved when disabling it.
• Improve accessibility of generated form fields by wrapping inputs in labels and using fieldsets for checkbox and radio fields.
• Improve validation and sanitization of submitted form data.
• Improve debug log safety by truncating overly long messages and improving email address obfuscation.

4.12.3 - May 5, 2026

• Improved Mailchimp Site Tracking Pixel support. Site is now automatically discovered or registered in Mailchimp when feature is enabled.
• Sign-up attempts for integrations are now processed asynchronously (via a scheduled event).
• Ensure mc4wp_refresh_mailchimp_lists is scheduled in site's local timezone.
• Added missing translator comments to all translatable strings.
• General code hardening and minor improvements as reported by the Plugin Check tool.

4.12.2 - Apr 20, 2026

• Add Mailchimp Campaign Archive block and [mc4wp_campaigns] shortcode to show an archive Mailchimp email campaigns. Props @faisalahammad.
• WooCommerce: Allow "after email" position for sign-up checkbox when using Checkout Block.
• WooCommerce: Detect use of Checkout Block and only show available positions.
• Show warning when cron is behind schedule. Props @faisalahammad.
• Add preliminary support for Mailchimp Site Tracking Pixel. Props @faisalahammad.

4.12.1 – Mar 26, 2026

• Supply a custom capability type to register_post_type for the mc4wp-form post type.
• Limit allowed HTML in the various form messages to a safe subset on load (versus only on update).

4.12.0 - Mar 9, 2026

• Remove the ability to unsubscribe through a form. You should migrate to the Mailchimp hosted form for this, which does email verification.
• Add block properties so the form block can be reordered inside the Gutenberg editor.
• Fix redirect not occuring after running MC4WP actions.
• Various type fixes, PHPDoc improvements and removal of unused code.

The following fixes and improvements were contributed by Faisal Ahammad:

• Add WP Forms field setting for configuring double opt-in.
• Add PeepSo registration form integration.
• Fix required validation for Ninja Forms integration.
• Add autocomplete attribute to form fields.
• Enable live updates in Gravity Forms editor.

4.11.0 - Jan 20, 2026

• Add form setting to remove tags from existing subscribers.
• Add form setting to check for common email typos.
• In Prosopo integration, link directly to API key screen instead of user profile.
• Automatically convert string fields to a comma-separated string if an array value is received.
• Fix undefined key warning for new setting that emails to site administrator on errors.

4.10.9 - Nov 28, 2025

• Specify apiVersion in call to registerBlockType so that WordPress 6.9 knows it can use the new iframe based editor.
• Add new setting to send an email for critical errors, like API errors returned by Mailchimp.

4.10.8 - Oct 21, 2025

• Show warning to administrators if a form is showing but Mailchimp API key is not set.
• Update third-party JS dependencies.

4.10.7 - Sep 05, 2025

• Handle renewing lists through server-side redirect instead of JS component.