CVE-2026-24388: WPMasterToolKit Auth Bypass Vulnerability

CVE-2026-24388 Overview

CVE-2026-24388 is a Missing Authorization vulnerability [CWE-862] in the Ludwig You WPMasterToolKit plugin for WordPress. The flaw stems from incorrectly configured access control security levels that allow authenticated users with low privileges to perform actions outside their intended permission scope. The issue affects WPMasterToolKit versions up to and including 2.14.0.

The vulnerability carries a CVSS 3.1 base score of 4.3 (Medium) and requires network access with low-level privileges. Successful exploitation leads to limited integrity impact without affecting confidentiality or availability. WordPress administrators running the affected plugin should review their installations against the patched version.

Critical Impact

Authenticated users with low privileges can bypass authorization checks in the WPMasterToolKit plugin and trigger restricted plugin functionality, leading to limited integrity impact on affected WordPress sites.

Affected Products

• Ludwig You WPMasterToolKit WordPress plugin versions through 2.14.0
• WordPress sites with the wpmastertoolkit plugin installed and activated
• All WordPress deployments using vulnerable plugin versions regardless of underlying hosting environment

Discovery Timeline

• 2026-01-22 - CVE-2026-24388 published to NVD
• 2026-04-15 - Last updated in NVD database

Technical Details for CVE-2026-24388

Vulnerability Analysis

The vulnerability is classified as Missing Authorization under [CWE-862]. The WPMasterToolKit plugin exposes one or more functions or endpoints without verifying that the calling user possesses the required capability. WordPress plugins typically enforce authorization through current_user_can() checks and nonce validation. When these checks are absent or improperly configured, low-privileged authenticated users can invoke privileged operations.

The issue produces limited integrity impact, indicating attackers can modify data within the plugin's scope but cannot extract sensitive information or disrupt service. The EPSS data places exploitation probability low, suggesting limited active interest at this time.

Root Cause

The root cause is incorrectly configured access control security levels in the WPMasterToolKit plugin codebase through version 2.14.0. Plugin functions handling state-changing operations lack proper capability checks. This permits any authenticated user, including subscribers, to invoke functionality reserved for administrators or editors.

Attack Vector

The attack vector is network-based and requires authentication at the Subscriber level or higher. An attacker with a valid WordPress account sends crafted HTTP requests directly to the vulnerable plugin endpoints. No user interaction is required from a victim. The attacker bypasses the missing authorization check and executes restricted plugin actions.

No public proof-of-concept code has been released. See the Patchstack WordPress Vulnerability Report for additional technical details.

Detection Methods for CVE-2026-24388

Indicators of Compromise

• Unexpected modifications to WPMasterToolKit plugin settings or configurations performed by non-administrator accounts
• HTTP POST or AJAX requests to WPMasterToolKit plugin endpoints originating from low-privileged user sessions
• WordPress audit log entries showing privileged plugin actions tied to Subscriber or Contributor accounts

Detection Strategies

• Inventory WordPress installations and identify any running WPMasterToolKit version 2.14.0 or earlier
• Review web server access logs for repeated requests to admin-ajax.php or REST API endpoints referencing the plugin from low-privileged accounts
• Correlate WordPress user role data with plugin action logs to flag actions performed outside expected role permissions

Monitoring Recommendations

• Enable WordPress audit logging via a security plugin to capture role-based action telemetry
• Monitor for anomalous authenticated session activity targeting plugin AJAX or REST endpoints
• Alert on creation of new low-privileged accounts followed by immediate plugin endpoint access

How to Mitigate CVE-2026-24388

Immediate Actions Required

• Update the WPMasterToolKit plugin to a version higher than 2.14.0 once a patched release is available from the vendor
• Audit existing WordPress user accounts and remove unused or unnecessary low-privileged accounts
• Restrict new user registration on WordPress sites that do not require public account creation

Patch Information

The vulnerability affects WPMasterToolKit versions through 2.14.0. Administrators should consult the Patchstack WordPress Vulnerability Report for the latest patch availability and fixed version details.

Workarounds

• Deactivate the WPMasterToolKit plugin until a patched version is installed if the plugin is not business-critical
• Apply a Web Application Firewall (WAF) rule to block requests to vulnerable plugin endpoints from non-administrator sessions
• Disable open user registration in WordPress general settings to reduce the pool of authenticated attackers

# Disable open WordPress user registration via WP-CLI
wp option update users_can_register 0

# Verify installed WPMasterToolKit plugin version
wp plugin get wpmastertoolkit --field=version

# Deactivate the plugin until a patch is applied
wp plugin deactivate wpmastertoolkit