CVE-2026-1000 in MailerLite Plugin
Summary
by MITRE • 01/16/2026
The MailerLite - WooCommerce integration plugin for WordPress is vulnerable to unauthorized data modification and deletion in all versions up to, and including, 3.1.3. This is due to missing capability checks on the resetIntegration() function. This makes it possible for authenticated attackers, with Subscriber-level access and above, to reset the plugin's integration settings, delete all plugin options, and drop the plugin's database tables (woo_mailerlite_carts and woo_mailerlite_jobs), resulting in complete loss of plugin data including customer abandoned cart information and sync job history.
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Analysis
by VulDB Data Team • 01/17/2026
The vulnerability identified in CVE-2026-1000 affects the MailerLite - WooCommerce integration plugin for WordPress, representing a critical authorization flaw that undermines the security posture of e-commerce implementations. This vulnerability stems from inadequate capability validation within the plugin's resetIntegration() function, which operates without proper access controls to verify user privileges before executing sensitive operations. The flaw specifically targets authenticated users who possess Subscriber-level access or higher, creating a dangerous attack vector where relatively low-privilege users can exploit the system to cause substantial data integrity issues.
The technical implementation of this vulnerability manifests through the absence of capability checks that should validate whether an authenticated user possesses sufficient permissions to modify plugin configuration settings. According to CWE-284, this represents an improper access control vulnerability where the system fails to properly enforce authorization mechanisms. The resetIntegration() function operates without verifying that the requesting user has administrative privileges or specific plugin management permissions, allowing any authenticated user with Subscriber-level access to execute destructive operations against the plugin's database schema.
The operational impact of this vulnerability extends beyond simple data modification to encompass complete data loss scenarios that can severely disrupt e-commerce operations. When exploited, the vulnerability enables attackers to reset all plugin integration settings, effectively disabling the integration between WooCommerce and MailerLite services. More critically, the attack can result in the deletion of all plugin options and the complete removal of database tables including woo_mailerlite_carts and woo_mailerlite_jobs. This destruction of data structures leads to permanent loss of customer abandoned cart information, which represents valuable business intelligence for conversion optimization, and the complete removal of sync job history that tracks email marketing automation workflows.
The security implications of this vulnerability align with ATT&CK technique T1078 which covers valid accounts usage for persistence and privilege escalation. Attackers can leverage this weakness to compromise the integrity of marketing automation systems and customer data management processes. The affected database tables contain critical information about customer engagement and marketing automation workflows, making this vulnerability particularly dangerous for businesses relying on email marketing integrations. The destruction of woo_mailerlite_carts table specifically impacts the ability to track customer shopping behavior and recover abandoned purchases, while the removal of woo_mailerlite_jobs table eliminates historical records of email marketing automation processes.
Organizations using this plugin should immediately implement mitigations including upgrading to the latest plugin version where the capability checks have been properly implemented. The recommended remediation approach involves ensuring that all administrative functions validate user capabilities before execution, following the principle of least privilege where only users with appropriate administrative permissions can modify plugin settings. Additionally, regular security audits should verify that all plugin functions properly implement capability checks, and monitoring systems should be configured to detect unauthorized modification attempts. The vulnerability demonstrates the critical importance of implementing proper access controls in plugin development and highlights the need for security reviews of third-party WordPress integrations to prevent similar authorization flaws from compromising business-critical systems and customer data integrity.