CVE-2025-14533: ACF Extended Plugin Privilege Escalation

CVE-2025-14533 Overview

A critical privilege escalation vulnerability has been discovered in the Advanced Custom Fields: Extended (ACF Extended) plugin for WordPress. This vulnerability affects all versions up to and including 0.9.2.1 and allows unauthenticated attackers to register with administrator privileges, leading to complete site compromise.

The vulnerability exists in the insert_user function, which fails to properly restrict user roles during the registration process. When the 'role' field is mapped to a custom field within the plugin's form module, attackers can supply the 'administrator' role value during registration, bypassing intended access controls.

Critical Impact

Unauthenticated attackers can gain full administrator access to WordPress sites by exploiting improper role validation during user registration, potentially leading to complete site takeover.

Affected Products

• Advanced Custom Fields: Extended plugin for WordPress versions up to and including 0.9.2.1
• WordPress installations using ACF Extended with 'role' field mapped to custom fields
• Sites with ACF Extended form-based user registration enabled

Discovery Timeline

• 2026-01-20 - CVE CVE-2025-14533 published to NVD
• 2026-01-26 - Last updated in NVD database

Technical Details for CVE-2025-14533

Vulnerability Analysis

This privilege escalation vulnerability stems from improper privilege management (CWE-269) within the ACF Extended plugin's user registration functionality. The vulnerable code resides in the insert_user function located in module-form-action-user.php.

When WordPress sites utilize ACF Extended's form module to handle user registrations and configure 'role' as a mappable custom field, the plugin fails to validate or restrict which roles can be assigned. This oversight allows any user—including unauthenticated visitors—to submit registration requests that specify elevated privileges such as 'administrator'.

The attack requires no authentication or user interaction, making it particularly dangerous for publicly accessible WordPress installations. An attacker can exploit this vulnerability remotely by crafting a malicious registration request that includes the administrator role parameter.

Root Cause

The root cause lies in the insert_user function's failure to implement proper role validation before user creation. The function accepts role parameters from form submissions without checking whether the requested role is within an allowed subset. This missing authorization check allows arbitrary role assignment, violating the principle of least privilege.

The vulnerable code path can be traced through the form action user module, where user input flows directly into the user creation process without sanitization of the role field. For more details, see the WordPress ACF Extended File in the WordPress plugin repository.

Attack Vector

The attack is network-based and requires no authentication or prior access to the target system. An attacker can exploit this vulnerability through the following mechanism:

1. Identify a WordPress site running a vulnerable version of ACF Extended
2. Locate a registration form that utilizes the ACF Extended form module
3. Craft a registration request that includes the 'role' parameter set to 'administrator'
4. Submit the malicious registration request
5. Upon successful registration, the attacker gains full administrator access

The vulnerability condition requires that the site administrator has configured 'role' to be mapped to a custom field within the ACF Extended form configuration. Sites that do not use this specific configuration are not vulnerable.

Detection Methods for CVE-2025-14533

Indicators of Compromise

• Unexpected administrator accounts appearing in WordPress user management
• User registration logs showing role assignments to 'administrator' from unknown sources
• Database entries in wp_users and wp_usermeta tables with suspicious administrator role assignments
• Audit logs showing new admin user creation without corresponding legitimate admin activity

Detection Strategies

• Monitor WordPress user creation events for unexpected administrator role assignments
• Implement log analysis to detect registration attempts that include role parameter manipulation
• Deploy web application firewall (WAF) rules to inspect form submissions for unauthorized role values
• Review ACF Extended form configurations for exposed role field mappings

Monitoring Recommendations

• Enable comprehensive WordPress audit logging for user creation and role changes
• Configure real-time alerts for new administrator account creation
• Monitor web server access logs for suspicious POST requests to registration endpoints
• Implement SentinelOne Singularity XDR to detect post-exploitation activities following privilege escalation

How to Mitigate CVE-2025-14533

Immediate Actions Required

• Update ACF Extended plugin to version 0.9.2.2 or later immediately
• Audit all existing WordPress administrator accounts for unauthorized users
• Review ACF Extended form configurations and remove role field mappings if not required
• Temporarily disable user registration if patch cannot be applied immediately

Patch Information

The vulnerability has been addressed in ACF Extended version 0.9.2.2. The patch implements proper role validation in the user registration process, restricting which roles can be assigned through form submissions. The fix can be reviewed in the WordPress ACF Extended Module and the WordPress ACF Extended Field.

For comprehensive vulnerability intelligence on this issue, refer to the Wordfence Vulnerability Report.

Workarounds

• Remove the 'role' field mapping from ACF Extended form configurations
• Implement server-side validation to restrict role assignments during registration
• Use WordPress hooks to filter and validate role parameters before user insertion
• Deploy a WAF rule to block registration requests containing administrator role values

# Configuration example - Check current ACF Extended version
wp plugin list --name=acf-extended --format=table

# Update ACF Extended to the patched version
wp plugin update acf-extended

# List all administrator users to audit for unauthorized accounts
wp user list --role=administrator --format=table

# Optional: Temporarily disable user registration via wp-config.php
# Add to wp-config.php: define('DISALLOW_FILE_EDIT', true);