Email marketing plugins are high-value targets because they centralize subscriber data, campaign content, and automation logic inside WordPress, often alongside WooCommerce purchase signals and transactional email customization. That combination creates multiple security-sensitive surfaces: admin dashboards, form endpoints, stored templates that render HTML, scheduled jobs, and integrations with sending methods (SMTP/SES/SendGrid or vendor sending services). Weaknesses here commonly translate into stored XSS in templates/forms, CSRF-driven configuration changes, unauthorized access to subscriber lists, or leakage of integration metadata. MailPoet – Newsletters, Email Marketing, and Automation version 5.22.1 has successfully completed the CleanTalk Plugin Security Certification process and received PSC-2026-64629, confirming that the plugin was reviewed from a secure code perspective with attention to the most common exploitation paths for newsletter, automation, and WooCommerce email workflows.
| Name of | MailPoet – Newsletters, Email Marketing, and Automation |
| Version | 5.22.1 |
| Active installations | 500,000+ |
| Description | Use MailPoet to create, send, manage, and grow your email marketing campaigns – all without leaving your WordPress dashboard. |
| 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 | Site owners can run newsletter and automation workflows with the assurance of the “Plugin Security Certification” (PSC). As a best practice, restrict access to subscriber/campaign management to trusted admins, audit who can edit forms/templates, and review your sending configuration (SPF/DKIM + SMTP/API keys) with a least-privilege mindset. |
| Plugin Security Certification by CleanTalk |  |
| Logo of the plugin |  |
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Key Features
MailPoet provides an “all-in-WordPress” email marketing stack: a visual email builder with templates, subscriber and list management, and sending workflows for newsletters, blog post notifications, and welcome emails. For e-commerce sites, it adds WooCommerce-focused automation such as abandoned cart and post-purchase flows, plus options to customize WooCommerce transactional emails for consistent branding. It also supports segmentation and engagement tracking features that help teams target campaigns and improve deliverability over time. From a security standpoint, these capabilities are sensitive because they handle personally identifiable information (PII), render stored HTML in admin and/or front-end contexts (forms, previews, email templates), and expose multiple operational surfaces like admin pages, scheduled tasks, and integration settings (sending methods, API keys, optional third-party libraries).
Security Assurance
The CleanTalk Plugin Security Certification evaluation for newsletter and automation plugins focuses on realistic attacker models that target subscriber data access, campaign integrity, and injection surfaces. Typical abuse patterns include injecting JavaScript into stored templates, subject lines, or form-related content that gets rendered in wp-admin or on the site (stored XSS), forcing state changes via CSRF against administrators (modifying sending settings, enabling/disabling automations, exporting lists), abusing weak capability checks to let lower-privileged roles access subscriber lists or campaign management, and probing AJAX/REST-style handlers for information disclosure (diagnostics, internal identifiers, configuration state). The review validates that administrative features are consistently protected by appropriate capability checks at the handler level, that state-changing actions implement nonce/CSRF protections, that database access is handled safely, and that any values rendered into HTML contexts are output-encoded to reduce injection risk. Because email workflows can have business impact (deliverability, customer trust, and compliance), the review also considers leakage vectors such as overly verbose logs, unsafe debug endpoints, and insecure handling of integration metadata.
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-2026-64629, MailPoet – Newsletters, Email Marketing, and Automation version 5.22.1 demonstrates strong baseline security for the workflows that matter most in email marketing plugins: controlled access to subscriber and campaign management, safe handling of stored templates and forms, and consistent protections against common WordPress vulnerability classes that target endpoints, handlers, and stored configuration. This certification helps site owners run email marketing and WooCommerce automation with reduced risk that marketing tooling becomes an unintended injection, data exposure, or configuration attack surface. As a best practice, keep campaign editing limited to trusted administrators, review any custom HTML used in templates/forms, and maintain strong operational hygiene around sending credentials and deliverability settings.
Note: The date and certification information may change over time. It is advisable to verify the latest details on the plugin developer’s website.