The CVE-2026-1000 vulnerability affects the MailerLite – WooCommerce integration plugin for WordPress, specifically all versions up to and including 3.1.3. The root cause is a missing authorization check (CWE-862) in the resetIntegration() function, which does not verify whether the authenticated user has sufficient privileges before allowing critical operations. As a result, any user with Subscriber-level access or higher can invoke this function to reset the plugin's integration settings, delete all plugin options, and drop the plugin’s database tables named woo_mailerlite_carts and woo_mailerlite_jobs. These tables store important data such as customer abandoned cart information and synchronization job history. The vulnerability does not expose confidential data directly but severely impacts data integrity by enabling unauthorized modification and deletion of plugin data. The attack vector is remote and network-based (AV:N), requires low privileges (PR:L), no user interaction (UI:N), and affects the integrity of the system (I:H) without impacting confidentiality (C:N) or availability (A:N). No patches are currently linked, and no known exploits have been reported in the wild. The vulnerability was published on January 16, 2026, and assigned a CVSS v3.1 score of 6.5, categorized as medium severity.

For European organizations using WooCommerce with the MailerLite integration plugin, this vulnerability can lead to significant disruption of marketing automation and e-commerce operations. The loss of abandoned cart data and sync job history can degrade customer engagement and reduce sales recovery opportunities. Although the vulnerability does not compromise customer personal data confidentiality, the integrity loss can undermine trust in the e-commerce platform’s reliability and data accuracy. Organizations relying on this plugin for automated email marketing and cart recovery may experience operational setbacks and increased manual workload to restore lost data. The requirement for only Subscriber-level access means that even low-privileged users or compromised accounts could exploit this flaw, increasing the risk of insider threats or lateral movement attacks. This could be particularly impactful for small to medium-sized enterprises that rely heavily on WooCommerce and MailerLite for their online sales and marketing workflows.

Immediate mitigation should focus on restricting Subscriber-level users from accessing or invoking the resetIntegration() function. Administrators should audit user roles and permissions to ensure that only trusted users have access to plugin management features. Until an official patch is released, consider disabling or removing the MailerLite – WooCommerce integration plugin if it is not critical. Regularly back up the WordPress database, including plugin-specific tables, to enable recovery in case of data deletion. Monitor logs for unusual activities related to plugin settings changes or database table drops. Employ WordPress security plugins that can enforce capability checks and alert on unauthorized changes. Once a patch is available, apply it promptly. Additionally, implement multi-factor authentication (MFA) for all user accounts to reduce the risk of compromised credentials being used to exploit this vulnerability.