CVE-2026-0845: WCFM Plugin Privilege Escalation Flaw

CVE-2026-0845 Overview

The WCFM – Frontend Manager for WooCommerce along with Bookings Subscription Listings Compatible plugin for WordPress is vulnerable to unauthorized modification of data that can lead to privilege escalation due to a missing capability check on the WCFM_Settings_Controller::processing function in all versions up to, and including, 6.7.24. This makes it possible for authenticated attackers, with Shop Manager-level access and above, to update arbitrary options on the WordPress site. This can be leveraged to update the default role for registration to administrator and enable user registration for attackers to gain administrative user access to a vulnerable site.

Critical Impact

Authenticated attackers with Shop Manager privileges can escalate to full WordPress administrator access by modifying site options, completely compromising site security.

Affected Products

• WCFM – Frontend Manager for WooCommerce versions up to and including 6.7.24
• WordPress sites running vulnerable WCFM plugin versions
• WooCommerce installations utilizing WCFM for frontend management

Discovery Timeline

• 2026-02-10 - CVE-2026-0845 published to NVD
• 2026-02-10 - Last updated in NVD database

Technical Details for CVE-2026-0845

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), representing a critical authorization bypass flaw in the WCFM plugin's settings controller. The vulnerability exists because the WCFM_Settings_Controller::processing function fails to verify that the requesting user has appropriate capabilities before allowing WordPress option modifications.

When a user with Shop Manager privileges makes requests to the affected endpoint, the plugin processes the settings update without validating whether the user should have permission to modify arbitrary WordPress options. This oversight allows lower-privileged authenticated users to manipulate critical site settings that should only be accessible to administrators.

The attack enables a two-step privilege escalation: first, the attacker modifies the default user registration role to "administrator," and second, enables user registration if it's disabled. Once these options are changed, the attacker can simply register a new account that automatically receives administrator privileges.

Root Cause

The root cause of this vulnerability is a missing capability check in the WCFM_Settings_Controller::processing function. The vulnerable code in wcfm-controller-settings.php processes settings updates without verifying that the authenticated user has the required manage_options capability. Additionally, the AJAX handler in class-wcfm-ajax.php fails to implement proper authorization checks before invoking the settings controller.

WordPress plugins must implement capability checks using functions like current_user_can() to ensure users can only perform actions appropriate to their role. The absence of this check allows Shop Manager users—who have elevated WooCommerce permissions but should not have WordPress site administration rights—to modify any site option.

Attack Vector

The attack is network-based and requires authentication with at least Shop Manager-level privileges. An attacker exploits this vulnerability by sending crafted requests to the WCFM AJAX endpoint that handles settings updates.

The exploitation flow involves intercepting or crafting a POST request to the WordPress AJAX handler (wp-admin/admin-ajax.php) with the WCFM settings action. The attacker includes parameters to modify the default_role option to administrator and sets users_can_register to 1. Because the plugin fails to verify the user's capability to modify these options, the changes are applied directly to the WordPress options table.

Once successful, the attacker can register a new user account through the standard WordPress registration process, automatically receiving administrator privileges. This grants complete control over the WordPress installation, including the ability to install malicious plugins, modify content, access sensitive data, and compromise other users.

Detection Methods for CVE-2026-0845

Indicators of Compromise

• Unexpected changes to the default_role WordPress option, particularly if set to administrator
• The users_can_register option being enabled when it was previously disabled
• New administrator user accounts created without legitimate authorization
• AJAX requests to admin-ajax.php with WCFM settings-related actions from Shop Manager accounts
• Audit log entries showing WordPress option modifications by non-administrator users

Detection Strategies

• Monitor WordPress options table for unauthorized modifications to default_role and users_can_register
• Implement file integrity monitoring on WCFM plugin files to detect tampering
• Review access logs for suspicious AJAX POST requests targeting WCFM settings endpoints
• Set up alerts for new administrator account creation, especially following option changes
• Deploy web application firewall rules to detect exploitation attempts targeting WordPress plugin vulnerabilities

Monitoring Recommendations

• Enable WordPress audit logging to track all option changes and user registrations
• Configure alerts for any modification to security-sensitive WordPress options
• Monitor user role assignments and escalations, particularly to administrator level
• Implement real-time monitoring of AJAX endpoints commonly targeted by WordPress exploits
• Review Shop Manager account activity for unusual settings modification patterns

How to Mitigate CVE-2026-0845

Immediate Actions Required

• Update WCFM – Frontend Manager for WooCommerce to the latest patched version immediately
• Audit existing WordPress user accounts for unauthorized administrators created through exploitation
• Review and reset the default_role option to an appropriate non-administrator role
• Disable user registration if not required for site functionality
• Audit Shop Manager accounts for potential compromise or malicious activity

Patch Information

A security patch addressing this vulnerability is available in the WordPress Plugin Changeset. Site administrators should update to the latest version of the WCFM plugin through the WordPress admin dashboard or by manually downloading the patched version from the WordPress plugin repository.

For additional details on this vulnerability, consult the Wordfence Vulnerability Report.

Workarounds

• Temporarily deactivate the WCFM plugin if immediate patching is not possible
• Restrict Shop Manager role capabilities using a role management plugin until the patch is applied
• Implement web application firewall rules to block requests to the vulnerable WCFM settings endpoint
• Disable user registration at the WordPress level (Settings > General > Membership) as a mitigation measure
• Monitor and audit all administrative account changes during the remediation window

# WordPress CLI commands to verify and reset security options
# Check current default role setting
wp option get default_role

# Reset default role to subscriber (safe default)
wp option update default_role subscriber

# Check if user registration is enabled
wp option get users_can_register

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

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