CVE-2026-2446: PowerPack for LearnDash Auth Bypass Flaw

CVE-2026-2446 Overview

CVE-2026-2446 is a critical authorization bypass vulnerability affecting the PowerPack for LearnDash WordPress plugin versions prior to 1.3.0. The vulnerability stems from missing authorization and CSRF checks in an AJAX action, enabling unauthenticated attackers to modify arbitrary WordPress options and create administrative user accounts remotely.

Critical Impact

Unauthenticated attackers can completely compromise WordPress sites by modifying critical options like default_role and creating arbitrary admin users, leading to full site takeover.

Affected Products

• PowerPack for LearnDash WordPress plugin versions before 1.3.0
• WordPress installations using vulnerable PowerPack for LearnDash versions

Discovery Timeline

• 2026-03-06 - CVE-2026-2446 published to NVD
• 2026-03-09 - Last updated in NVD database

Technical Details for CVE-2026-2446

Vulnerability Analysis

This vulnerability is classified under CWE-862 (Missing Authorization), a fundamental security weakness where the application fails to verify that a user has the proper privileges before performing restricted operations. The vulnerable AJAX endpoint in PowerPack for LearnDash lacks both authorization checks and Cross-Site Request Forgery (CSRF) token validation, creating a dangerous attack surface.

The absence of these security controls means that any unauthenticated user can interact with the AJAX action and manipulate WordPress options that should be restricted to administrators. WordPress options control critical site behavior including user registration defaults, plugin configurations, and security settings. By modifying the default_role option to "administrator" and then registering a new account, attackers can gain complete administrative control over the target WordPress installation.

Root Cause

The root cause is the absence of proper authorization checks and CSRF token validation in the plugin's AJAX handler. WordPress provides built-in functions such as current_user_can() for authorization verification and wp_verify_nonce() for CSRF protection. The vulnerable code path fails to implement either of these security mechanisms before processing option update requests, violating the principle of least privilege.

Attack Vector

The attack is executed over the network without requiring any authentication or user interaction. An attacker can directly send crafted HTTP requests to the vulnerable AJAX endpoint. The exploitation flow typically involves:

1. Identifying a WordPress site running a vulnerable version of PowerPack for LearnDash
2. Sending a malicious AJAX request to modify the default_role WordPress option to "administrator"
3. Registering a new user account through the standard WordPress registration process
4. Gaining immediate administrative access to the compromised site

The vulnerability can be exploited by sending a specially crafted POST request to the WordPress AJAX handler (/wp-admin/admin-ajax.php) with the appropriate action parameter and option values. Since no authentication is required and CSRF validation is missing, this request can originate from any external source. For detailed technical information, refer to the WPScan Vulnerability Report.

Detection Methods for CVE-2026-2446

Indicators of Compromise

• Unexpected changes to WordPress options, particularly default_role, users_can_register, or admin_email
• Creation of new administrator accounts without legitimate administrative action
• Suspicious POST requests to /wp-admin/admin-ajax.php from external or unknown IP addresses
• Unusual user registration activity, especially accounts immediately gaining administrative privileges

Detection Strategies

• Monitor WordPress wp_options table for unauthorized modifications to security-sensitive options
• Implement web application firewall (WAF) rules to detect and block suspicious AJAX requests targeting option modification endpoints
• Review Apache/Nginx access logs for anomalous POST requests to admin-ajax.php with unusual parameters
• Deploy file integrity monitoring to detect unauthorized changes to WordPress core files and plugin configurations

Monitoring Recommendations

• Enable WordPress audit logging to track all option changes with timestamp and source IP
• Configure alerts for new user registrations, especially those assigned administrator roles
• Implement real-time monitoring of the wp_usermeta and wp_users tables for unexpected insertions
• Use SentinelOne Singularity to monitor for post-exploitation activities following WordPress compromise

How to Mitigate CVE-2026-2446

Immediate Actions Required

• Update PowerPack for LearnDash plugin to version 1.3.0 or later immediately
• Audit the wp_users table for any unauthorized administrator accounts created recently
• Review and reset the default_role WordPress option to its intended value (typically "subscriber")
• Review all WordPress options for unauthorized modifications and restore from a known-good backup if necessary
• Temporarily disable user registration if not required while performing security assessment

Patch Information

The vulnerability has been addressed in PowerPack for LearnDash version 1.3.0. Site administrators should update through the WordPress plugin management interface or by downloading the latest version directly from the plugin source. After updating, verify the plugin version in the WordPress admin dashboard under Plugins.

Workarounds

• If immediate patching is not possible, disable the PowerPack for LearnDash plugin until the update can be applied
• Implement WAF rules to block unauthenticated POST requests to the vulnerable AJAX action
• Restrict access to /wp-admin/admin-ajax.php from untrusted IP addresses using server-level access controls
• Disable WordPress user registration by setting users_can_register to 0 in the options table

# WordPress CLI commands to verify and secure configuration
# Check current default role setting
wp option get default_role

# Reset default role to subscriber if modified
wp option update default_role subscriber

# Disable user registration if not needed
wp option update users_can_register 0

# List all administrator users for audit
wp user list --role=administrator --fields=ID,user_login,user_email,user_registered