CVE-2026-1925: EmailKit WordPress Auth Bypass Vulnerability

CVE-2026-1925 Overview

The EmailKit – Email Customizer for WooCommerce & WP plugin for WordPress contains an authorization bypass vulnerability (CWE-862) that enables unauthorized data modification. The vulnerability exists due to a missing capability check on the update_template_data function in all versions up to and including 1.6.2. This security flaw allows authenticated attackers with Subscriber-level access or higher to modify the title of any post on the site, including posts, pages, and custom post types.

Critical Impact

Authenticated users with minimal privileges (Subscriber-level) can modify post titles across the entire WordPress site, potentially enabling defacement, SEO manipulation, or phishing attacks through content modification.

Affected Products

• EmailKit – Email Customizer for WooCommerce & WP plugin versions up to and including 1.6.2
• WordPress sites utilizing the affected EmailKit plugin versions

Discovery Timeline

• 2026-02-18 - CVE CVE-2026-1925 published to NVD
• 2026-02-18 - Last updated in NVD database

Technical Details for CVE-2026-1925

Vulnerability Analysis

This vulnerability represents a Missing Authorization flaw (CWE-862) in the EmailKit plugin's AJAX handler functionality. The core issue resides in the update_template_data function located within the EmailKitAjax.php file. When processing AJAX requests to update template data, the plugin fails to verify whether the requesting user possesses the appropriate capabilities to perform such modifications.

WordPress's role-based access control system typically restricts content modification to users with Editor or Administrator roles. However, due to the missing capability check in EmailKit, even users with the lowest authenticated role (Subscriber) can invoke the update_template_data function to alter post titles across the site.

Root Cause

The root cause of this vulnerability is the absence of proper authorization validation in the update_template_data function. The affected code at line 150 of EmailKitAjax.php processes user input without first calling WordPress capability check functions such as current_user_can() to verify the user has appropriate permissions.

In WordPress plugin development, AJAX handlers that modify data must implement capability checks to ensure only authorized users can perform sensitive operations. The EmailKit plugin registers this AJAX action for authenticated users but does not restrict it to users with content management capabilities.

Attack Vector

The attack can be executed remotely over the network by any authenticated WordPress user. An attacker needs to:

1. Obtain valid credentials for a WordPress account with at least Subscriber-level access
2. Craft a malicious AJAX request targeting the update_template_data action
3. Include the target post ID and the modified title content in the request payload

The attack requires no user interaction beyond the initial authentication and can be executed programmatically to modify multiple posts in rapid succession. The vulnerability enables unauthorized modification of any post, page, or custom post type on the affected WordPress installation.

Detection Methods for CVE-2026-1925

Indicators of Compromise

• Unexpected changes to post, page, or custom post type titles
• AJAX requests to WordPress admin-ajax.php with the update_template_data action from Subscriber-level users
• Post revision history showing modifications by users who should not have edit permissions
• Audit log entries showing unauthorized content modification attempts

Detection Strategies

• Monitor WordPress audit logs for post title modifications by Subscriber-level accounts
• Implement Web Application Firewall (WAF) rules to flag or block AJAX requests to the update_template_data endpoint from low-privilege users
• Review server access logs for unusual patterns of admin-ajax.php requests
• Deploy file integrity monitoring to detect unauthorized content changes

Monitoring Recommendations

• Enable comprehensive WordPress activity logging with plugins that track user actions
• Configure alerts for any post modifications by users with Subscriber role
• Implement database change monitoring for the wp_posts table
• Review user activity reports regularly for anomalous behavior patterns

How to Mitigate CVE-2026-1925

Immediate Actions Required

• Update the EmailKit plugin to a version newer than 1.6.2 that contains the security fix
• Review WordPress user accounts and remove unnecessary Subscriber accounts
• Audit post revision history for any unauthorized title modifications
• Consider temporarily deactivating the EmailKit plugin until patching is complete

Patch Information

The vulnerability has been addressed in versions after 1.6.2. The security fix can be reviewed in the WordPress EmailKit Changeset. Site administrators should update to the latest available version through the WordPress plugin repository.

Additional technical details and vulnerability information are available in the Wordfence Vulnerability Report.

Workarounds

• Restrict user registration to prevent attackers from obtaining Subscriber accounts
• Implement additional access control using a security plugin with capability hardening features
• Use a Web Application Firewall to block suspicious AJAX requests to the affected endpoint
• Remove or demote unnecessary user accounts with Subscriber-level access or above