Email marketing remains one of the most effective and measurable growth channels for WordPress sites—whether you run an eCommerce store, a content site, a SaaS landing page, or a community. But newsletter plugins sit right on top of sensitive surfaces: public-facing forms, user identity fields, third-party API tokens, and deep integrations with checkout, registration, and contact systems. That combination makes security non-negotiable.
MC4WP: Mailchimp for WordPress (v4.11.1) is widely recognized as the #1 Mailchimp integration plugin for WordPress, providing flexible signup forms and broad compatibility with popular form and commerce plugins. With Plugin Security Certification (PSC-2026-64599) from CleanTalk, MC4WP is now formally validated for secure operation in real-world WordPress environments—especially important when handling subscriber data and Mailchimp connectivity.
| Name of | MC4WP: Mailchimp for WordPress |
| Version | 4.11.1 |
| Downloads | 2 000 000+ |
| Description | The #1 Mailchimp plugin for WordPress. Allows you to add a multitude of newsletter sign-up methods to your site. |
| Security | Successfully tested for: SQL Injection (SQLi) Cross-Site Scripting (XSS) – Stored & Reflected Cross-Site Request Forgery (CSRF) Authentication Vulnerabilities Authentication Bypass Exploits Privilege Escalation Buffer Overflow Denial-of-Service (DoS) vectors Data Leakage Vulnerabilities Insecure Dependency Usage Remote Code Execution (RCE) Risks Unauthorized File Access Insufficient Injection Protection Information Disclosure via Misconfigured Endpoints |
| CleanTalk Certification | Proudly earned the “Plugin Security Certification” (PSC) from CleanTalk, indicating adherence to stringent security standards. |
| Additional Information | Users can confidently manage age restrictions with the assurance of the “Plugin Security Certification” (PSC). Verify the latest details on the plugin developer’s website. |
| Plugin Security Certification by CleanTalk |  |
| Logo of the plugin |  |
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Key Features
Fast Mailchimp Connection and List Growth
MC4WP makes it straightforward to connect your WordPress site to Mailchimp and start collecting subscribers quickly. The setup flow is designed to minimize complexity while ensuring reliable Mailchimp API connectivity.
Flexible Signup Forms (Accessible, Mobile-Optimized, HTML-Based)
You can build good-looking, user-friendly, mobile-optimized signup forms with full control over fields. A key advantage is the ability to create forms using native HTML, making it easy to tailor markup for accessibility and performance.
Deep Integrations Across the WordPress Ecosystem
MC4WP can integrate directly with many widely-used WordPress components and plugins, including:
- WordPress Comment Form
- WordPress Registration Form
- Contact Form 7
- WooCommerce
- Gravity Forms
- Ninja Forms 3
- WPForms
- BuddyPress
- MemberPress
- Events Manager
- Easy Digital Downloads
- Give
- UltimateMember
- HTML Forms
- AffiliateWP
If a plugin isn’t listed, MC4WP often still supports it through custom integrations. For developers, MC4WP also provides a PHP API to programmatically add subscribers—useful for advanced funnels and custom workflows.
Premium Enhancements for eCommerce Intelligence
MC4WP Premium can connect WooCommerce order data to Mailchimp so you can measure revenue attribution and subscriber purchasing behavior more precisely—bridging marketing and commerce data without manual work.
Developer-Friendly and Future-Ready
MC4WP is well documented and developer-oriented, with example snippets and an active GitHub presence. It is also ready for PHP 8.5 while maintaining backward compatibility to PHP 7.4, making it suitable for a wide range of hosting environments.
Security Assurance
MC4WP v4.11.1 has received CleanTalk Plugin Security Certification (PSC-2026-64599), confirming that the plugin passed a rigorous security review and testing process designed to detect exploitable weaknesses—especially those commonly found in form-handling and integration-heavy plugins.
The plugin has been successfully tested for:
✅ Information Leakage Vulnerabilities
✅ SQL Injection Vulnerabilities
✅ Cross-Site Scripting (XSS) Attacks
✅ Cross-Site Request Forgery (CSRF) Attacks
✅ Authentication & Authentication Bypass Vulnerabilities
✅ Privilege Escalation Vulnerabilities
✅ Buffer Overflow Vulnerabilities
✅ Denial-of-Service (DoS) Vulnerabilities
✅ Data Leakage Vulnerabilities
✅ Insecure Dependencies
✅ Code Execution Vulnerabilities
✅ File Unauthorized Access Vulnerabilities
✅ Insufficient Injection Protection
Newsletter plugins are exposed to repeated hostile input attempts because signup forms are public. They also frequently touch identity fields (name/email), integrate into checkout flows, and store configuration data (including API-related parameters). Certification indicates that the plugin’s codebase and behaviors have been reviewed to reduce risks such as injection attacks, CSRF-triggered administrative changes, data exposure through improper logging, and privilege boundary mistakes inside WordPress admin contexts.
Conclusion
MC4WP: Mailchimp for WordPress (v4.11.1) remains one of the most capable Mailchimp integrations available for WordPress, powering signup forms and plugin integrations across a broad range of site types. With its CleanTalk Plugin Security Certification (PSC-2026-64599), it also demonstrates that convenience and growth features do not come at the expense of security.
If you need a Mailchimp integration that is flexible for marketers, extensible for developers, and verified against critical vulnerability classes, MC4WP v4.11.1 is a strong, security-backed choice.
Note: The date and certification information may change over time. It is advisable to verify the latest details on the plugin developer’s website.