CVE-2025-54049: Custom API for WP Privilege Escalation

CVE-2025-54049 Overview

CVE-2025-54049 is an Incorrect Privilege Assignment vulnerability (CWE-266) in the miniOrange Custom API for WP WordPress plugin. This security flaw allows authenticated attackers to escalate their privileges beyond their authorized access level within the WordPress environment. The vulnerability affects all versions of the plugin up to and including version 4.2.2.

Critical Impact

Attackers can exploit incorrect privilege assignment to escalate from low-privileged user accounts to gain administrative access, potentially leading to complete site takeover, data theft, and malicious content injection.

Affected Products

• miniOrange Custom API for WP plugin versions up to and including 4.2.2
• WordPress installations using the vulnerable custom-api-for-wp plugin
• Sites utilizing the Custom API for WP functionality for REST API customization

Discovery Timeline

• 2025-08-20 - CVE-2025-54049 published to NVD
• 2026-04-01 - Last updated in NVD database

Technical Details for CVE-2025-54049

Vulnerability Analysis

This vulnerability stems from improper privilege assignment within the Custom API for WP plugin's authorization mechanisms. The plugin fails to properly validate and enforce user role restrictions when processing certain API requests or administrative functions. This allows users with lower privilege levels (such as subscribers or contributors) to perform actions that should be restricted to administrators only.

The Incorrect Privilege Assignment (CWE-266) weakness category indicates that the software incorrectly assigns a privilege to a particular entity, granting that entity unintended capabilities. In the context of this WordPress plugin, this can result in unauthorized users gaining elevated permissions within the WordPress content management system.

Root Cause

The root cause of CVE-2025-54049 lies in insufficient access control validation within the Custom API for WP plugin. The plugin does not properly verify user capabilities before allowing access to privileged functionality. This may occur in custom API endpoint handlers or administrative settings pages where capability checks are missing or improperly implemented.

WordPress plugins should utilize the current_user_can() function to verify user capabilities before executing privileged operations. When this validation is missing or incorrectly implemented, privilege escalation becomes possible.

Attack Vector

An attacker with a low-privileged WordPress account (such as a subscriber role) can exploit this vulnerability to gain elevated privileges. The attack typically involves:

1. Creating or obtaining access to a low-privileged WordPress user account
2. Interacting with the Custom API for WP plugin's vulnerable functionality
3. Bypassing authorization checks due to incorrect privilege assignment
4. Gaining access to administrative functions or elevating account privileges

The vulnerability allows authenticated users to escalate their privileges within the WordPress installation, potentially gaining full administrative control over the affected site. For detailed technical information, refer to the Patchstack vulnerability database.

Detection Methods for CVE-2025-54049

Indicators of Compromise

• Unexpected user role changes in WordPress user accounts, particularly elevation to administrator
• Unusual activity logs showing low-privileged users accessing administrative functions
• New administrator accounts created without authorization
• Suspicious API requests to Custom API for WP endpoints from non-admin users

Detection Strategies

• Monitor WordPress user role changes and alert on unexpected privilege elevations
• Review access logs for the Custom API for WP plugin endpoints for anomalous patterns
• Implement file integrity monitoring to detect unauthorized changes to WordPress core files or plugin configurations
• Audit user account activity for actions inconsistent with assigned roles

Monitoring Recommendations

• Enable comprehensive logging for WordPress user authentication and role modification events
• Configure alerts for any user role changes, especially promotions to administrator
• Monitor REST API endpoints associated with the Custom API for WP plugin for unauthorized access attempts
• Regularly review the WordPress users table for newly created or modified administrator accounts

How to Mitigate CVE-2025-54049

Immediate Actions Required

• Update the miniOrange Custom API for WP plugin to the latest available version that addresses this vulnerability
• Audit all WordPress user accounts for unauthorized privilege escalations and revert any suspicious changes
• Review WordPress access logs to identify potential exploitation attempts
• Consider temporarily disabling the Custom API for WP plugin until a patch can be applied

Patch Information

Organizations should monitor the Patchstack vulnerability advisory for patch availability and update instructions. Upgrade the Custom API for WP plugin to a version higher than 4.2.2 when available from the plugin vendor (miniOrange).

Workarounds

• Temporarily deactivate the Custom API for WP plugin if not critical to site operations
• Implement additional access controls at the web server level to restrict access to plugin administrative functions
• Use a WordPress security plugin to enforce stricter capability checks and monitor for privilege escalation attempts
• Limit user registration and restrict the creation of new user accounts until the vulnerability is patched

# WordPress CLI command to list users with elevated privileges for audit
wp user list --role=administrator --fields=ID,user_login,user_email,user_registered

# Check installed plugin version
wp plugin list --name=custom-api-for-wp --fields=name,status,version

# Temporarily deactivate the vulnerable plugin
wp plugin deactivate custom-api-for-wp