CVE-2026-2446: PowerPack LearnDash Auth Bypass Flaw

CVE-2026-2446 Overview

CVE-2026-2446 affects the PowerPack for LearnDash WordPress plugin in versions prior to 1.3.0. The plugin exposes an AJAX action without authorization or Cross-Site Request Forgery (CSRF) protections. Unauthenticated attackers can invoke the action to update arbitrary WordPress options, including default_role, and create administrator accounts. The flaw is tracked under CWE-862: Missing Authorization and enables full site takeover from the network without user interaction.

Critical Impact
Unauthenticated attackers can modify WordPress options and create arbitrary administrator users, resulting in complete site compromise.

Affected Products

PowerPack for LearnDash WordPress plugin versions before 1.3.0
WordPress sites running LearnDash with the vulnerable PowerPack add-on installed
Any LearnDash-based learning management deployment using PowerPack prior to the fixed release

Discovery Timeline

2026-03-06 - CVE-2026-2446 published to the National Vulnerability Database (NVD)
2026-04-15 - Last updated in NVD database

Technical Details for CVE-2026-2446

Vulnerability Analysis

The PowerPack for LearnDash plugin registers an AJAX handler that processes requests without verifying the caller's identity or session token. WordPress AJAX endpoints require two protections: capability checks confirming the user is authorized, and nonce validation confirming the request originated from a legitimate page. The vulnerable handler implements neither control.

Because the action is registered through wp_ajax_nopriv_, unauthenticated visitors reach the same code path as logged-in users. The handler accepts option name and value parameters from the request body and writes them directly through WordPress option APIs. Attackers exploit this primitive by overwriting security-relevant options across the site.

The most direct exploitation path targets the default_role option. After setting default_role to administrator, an attacker enables open registration through the users_can_register option and submits the standard WordPress registration form. The new account is granted administrator privileges automatically, providing complete control of the site, its content, and its database.

Root Cause

The root cause is missing authorization, classified under CWE-862. The plugin does not call current_user_can() to verify privileges, and it omits check_ajax_referer() for nonce validation. Both controls are standard WordPress requirements for state-changing AJAX actions.

Attack Vector

The attack vector is network-based and requires no authentication or user interaction. An attacker sends a crafted HTTP POST request to wp-admin/admin-ajax.php referencing the vulnerable action and supplying the target option name and value. After flipping registration settings, the attacker registers an account that inherits administrator capabilities. Public exploit details are documented in the WPScan Vulnerability Report.

Detection Methods for CVE-2026-2446

Indicators of Compromise

Unexpected administrator accounts created in wp_users with recent registration timestamps
Modifications to the default_role option set to administrator in wp_options
The users_can_register option toggled to 1 without an administrator action
POST requests to /wp-admin/admin-ajax.php from unauthenticated sessions referencing PowerPack actions

Detection Strategies

Audit the wp_users and wp_usermeta tables for accounts assigned the administrator role outside change windows
Monitor web server logs for repeated admin-ajax.php POST requests lacking authenticated session cookies
Compare WordPress option values against a known-good baseline to flag unauthorized changes
Inspect plugin version metadata across managed sites to confirm PowerPack for LearnDash is at 1.3.0 or later

Monitoring Recommendations

Forward WordPress audit logs and web server access logs to a centralized logging platform for correlation
Alert on any change to default_role, users_can_register, or siteurl options
Track new user registrations and flag accounts elevated to administrator within minutes of creation
Enable Web Application Firewall (WAF) rules that inspect admin-ajax.php parameters for option manipulation patterns

How to Mitigate CVE-2026-2446

Immediate Actions Required

Update PowerPack for LearnDash to version 1.3.0 or later on all WordPress installations
Review administrator account lists and remove any accounts that cannot be attributed to legitimate users
Reset credentials for remaining administrator accounts and enforce multi-factor authentication
Verify the default_role option is set to subscriber and users_can_register reflects the intended policy

Patch Information

The vendor addressed CVE-2026-2446 in PowerPack for LearnDash version 1.3.0 by adding capability and nonce checks to the affected AJAX action. Refer to the WPScan Vulnerability Report for advisory details and remediation guidance.

Workarounds

Disable the PowerPack for LearnDash plugin until the patched version can be deployed
Restrict access to /wp-admin/admin-ajax.php at the WAF for unauthenticated requests targeting plugin actions
Block requests that attempt to set option_name parameters such as default_role or users_can_register
Place the site behind an authentication proxy or IP allowlist during the remediation window

bash

# Example WP-CLI commands to verify configuration after patching
wp plugin update powerpack-for-learndash --version=1.3.0
wp option get default_role
wp option get users_can_register
wp user list --role=administrator --fields=ID,user_login,user_registered