CVE-2025-5071: AI Engine Plugin Privilege Escalation Flaw

CVE-2025-5071 Overview

CVE-2025-5071 affects the AI Engine plugin for WordPress, a popular AI integration plugin from meowapps. The vulnerability is a missing authorization flaw [CWE-863] in the Meow_MWAI_Labs_MCP::can_access_mcp function across versions 2.8.0 through 2.8.3. Authenticated users with subscriber-level access or higher can invoke the Model Context Protocol (MCP) endpoint without proper capability checks. Successful exploitation grants full access to administrative commands including wp_create_user, wp_update_user, wp_update_option, wp_update_post, wp_delete_post, wp_update_comment, and wp_delete_comment. Attackers can leverage these primitives for privilege escalation and full site takeover.

Critical Impact
Authenticated subscribers can escalate to administrator, create new admin users, and modify or delete arbitrary posts and comments through the MCP interface.

Affected Products

AI Engine plugin for WordPress version 2.8.0
AI Engine plugin for WordPress version 2.8.1
AI Engine plugin for WordPress versions through 2.8.3

Discovery Timeline

2025-06-19 - CVE-2025-5071 published to NVD
2025-08-11 - Last updated in NVD database

Technical Details for CVE-2025-5071

Vulnerability Analysis

The AI Engine plugin exposes a Model Context Protocol (MCP) endpoint that allows AI agents to invoke WordPress functions. The endpoint is gated by the Meow_MWAI_Labs_MCP::can_access_mcp function, which is intended to enforce authorization before processing MCP commands. In versions 2.8.0 to 2.8.3, this function fails to validate the caller's WordPress capabilities. Any authenticated session — including users registered at the lowest subscriber tier — passes the access check.

Once inside the MCP handler, the attacker can dispatch high-privilege commands. Operations like wp_create_user and wp_update_user enable account creation and role assignment. The wp_update_option command lets attackers tamper with site-wide settings, including the default user role, which is a well-documented path to administrator takeover. Post and comment commands enable defacement and content manipulation.

Root Cause

The flaw is a broken access control issue [CWE-863] in Meow_MWAI_Labs_MCP::can_access_mcp. The function does not call current_user_can() with an appropriate administrative capability such as manage_options. Authentication alone is treated as sufficient authorization for privileged MCP actions.

Attack Vector

The attack is network-reachable and requires only low-privilege authentication. A subscriber account — often obtainable via open registration on WordPress sites — is enough. After authenticating, the attacker sends crafted requests to the MCP endpoint invoking sensitive command names. No user interaction is required. Refer to the Wordfence Vulnerability Analysis and the WordPress AI Engine Code for the unpatched implementation.

No public proof-of-concept exploit code is available at this time.

Detection Methods for CVE-2025-5071

Indicators of Compromise

Unexpected administrator or editor accounts created after the plugin was installed at vulnerable versions.
WordPress wp_options changes to default_role set to administrator or other elevated roles.
Requests to the AI Engine MCP endpoint originating from subscriber sessions.
Unexplained modifications or deletions of posts and comments performed by low-privilege users.

Detection Strategies

Inspect web server access logs for POST requests to the AI Engine MCP route, correlating the authenticated user role with the invoked command.
Audit the wp_users and wp_usermeta tables for recently created accounts holding administrator capability.
Review the WordPress activity log, if installed, for wp_create_user, wp_update_user, and wp_update_option calls outside scheduled administrative work.

Monitoring Recommendations

Alert on any change to the default_role option in WordPress.
Monitor plugin version inventory to identify hosts still running AI Engine versions 2.8.0 through 2.8.3.
Track new user registrations and immediate role promotions occurring within short time windows.

How to Mitigate CVE-2025-5071

Immediate Actions Required

Update the AI Engine plugin to version 2.8.4 or later on all WordPress installations.
Audit existing user accounts and revoke any unauthorized administrator or editor privileges.
Disable open user registration if it is not required for site functionality.
Rotate credentials for administrative accounts after confirming the patch is applied.

Patch Information

The vendor addressed the issue by adding a capability check to Meow_MWAI_Labs_MCP::can_access_mcp. The fix is documented in the WordPress AI Engine Changeset. Site administrators should upgrade through the WordPress plugin manager or by deploying the patched release directly.

Workarounds

Deactivate the AI Engine plugin until the patched version is deployed.
Restrict access to the MCP endpoint at the web server or WAF layer to trusted IP ranges.
Temporarily disable the MCP feature within the AI Engine plugin settings if upgrading is not immediately possible.

bash

# Configuration example: block MCP endpoint at the web server
# Apache .htaccess example - replace with the actual MCP route used by your installation
<LocationMatch "/wp-json/mwai/.*/mcp">
    Require ip 203.0.113.0/24
</LocationMatch>