Email marketing plugins operate across several high-risk boundaries in WordPress because they combine subscriber data handling, admin-side campaign management, form collection and segmentation, scheduled and automated sending logic, and in some deployments external delivery infrastructure. Weaknesses in this class of plugin can lead to stored XSS in administrative interfaces, unauthorized access to subscriber information, misuse of automation workflows, or abuse of privileged settings that affect site communications and user trust. MailPoet version 5.23.2 has successfully completed the CleanTalk Plugin Security Certification process and received PSC-2026-64647, confirming that the plugin was reviewed from a secure code perspective with attention to the most common exploitation paths for newsletter, subscriber management, email automation, and WooCommerce email plugins.
| Name of | MailPoet |
| Version | 5.23.2 |
| Active installations | 500,000+ |
| Description | MailPoet helps WordPress site owners create, send, manage, and grow email marketing campaigns directly from the WordPress dashboard, including newsletters, subscription forms, automated emails, post notifications, subscriber list management, WooCommerce email flows, and delivery through MailPoet Sending Service or other supported sending methods. |
| 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 | Use MailPoet with confidence backed by the “Plugin Security Certification” (PSC). Always verify the latest plugin details and keep WordPress core and dependent components up to date. |
| Plugin Security Certification by CleanTalk |  |
| Logo of the plugin |  |
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Key Features
MailPoet provides a full in-dashboard email marketing workflow for WordPress, allowing site owners to build newsletters, manage subscribers and subscriber lists, place subscription forms on the site, send post notification emails automatically, and configure automated email sequences for onboarding and engagement. The plugin also includes WooCommerce-oriented email functionality such as abandoned cart messaging, first purchase flows, product and category-based targeting, and customization of transactional emails, while supporting segmentation, analytics, and multiple delivery methods including the MailPoet Sending Service. These capabilities matter from a security perspective because they intersect with several sensitive surfaces at once: subscriber personally identifiable information, wp-admin campaign and automation interfaces, form submission and consent collection paths, scheduled task execution, and in some cases third-party delivery and telemetry integrations where operational data crosses system boundaries.
Security Assurance
The CleanTalk Plugin Security Certification evaluation for email marketing and automation plugins focuses on the defensive handling of features that would be particularly attractive to an attacker. In this class of software, common abuse patterns include attempts to inject payloads into subscriber fields, campaign content, templates, or admin previews, exploit weak access control to read or modify subscriber lists and campaign settings, abuse AJAX or background processing flows to trigger unauthorized actions, and leverage missing nonce enforcement to perform CSRF against privileged users managing email operations. Because email plugins frequently process sensitive business data and may influence communications sent to large user populations, the review validates that administrative actions are protected by appropriate roles and capability checks, that state-changing operations implement nonce validation, and that subscriber and campaign data are handled safely across collection, storage, segmentation, rendering, and sending workflows. Particular attention is paid to subscriber data protection, safe rendering of email and form content, automation integrity, and preventing convenience features from becoming injection, disclosure, or privilege boundary failures.
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
Conclusion
With PSC-2026-64647, MailPoet version 5.23.2 demonstrates a strong baseline security posture for the workflows that matter most in newsletter and email automation tooling: collecting and managing subscribers, composing and rendering email content safely, enforcing access control over campaigns and settings, and protecting automation and WooCommerce-related communication flows from common WordPress attack classes. This certification helps site owners and development teams reduce operational and reputational risk by choosing a solution that has been checked against common vulnerability patterns affecting plugins that process subscriber data and privileged messaging functions. As a best practice, restrict who can manage subscriber lists and campaigns, review how custom email and form content is rendered, validate consent and data handling policies for subscriber collection, and keep WordPress core, MailPoet, and all related infrastructure components up to date.
Note: The date and certification information may change over time. It is advisable to verify the latest details on the plugin developer’s website.