CVE-2025-3292: User Registration Plugin Auth Bypass Flaw

CVE-2025-3292 Overview

CVE-2025-3292 affects the User Registration & Membership plugin for WordPress developed by WPEverest. The flaw is an Insecure Direct Object Reference [CWE-639] in the user_registration_update_profile_details() function. The function fails to validate the user-controlled user_id key before processing profile updates. Attackers who know a target's user ID and email address can change that user's password without authorization. All plugin versions up to and including 4.1.3 are affected. The issue was published to the National Vulnerability Database (NVD) on April 12, 2025.

Critical Impact

Attackers with knowledge of a victim's user ID and email can reset arbitrary user passwords, enabling account takeover of site administrators and members.

Affected Products

• WPEverest User Registration & Membership plugin for WordPress (free edition)
• All versions through 4.1.3
• Vulnerable function: user_registration_update_profile_details() in includes/class-ur-ajax.php

Discovery Timeline

• 2025-04-12 - CVE-2025-3292 published to NVD
• 2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-3292

Vulnerability Analysis

The vulnerability resides in the user_registration_update_profile_details() AJAX handler within class-ur-ajax.php. The handler accepts a user_id parameter from the client without verifying that the submitting user owns that account or has authority to modify it. Because the handler also processes password changes, an attacker can submit a crafted request specifying another user's ID along with a new password value. The plugin applies the update as if it originated from the legitimate account owner. This design flaw matches the classic pattern described by CWE-639: Authorization Bypass Through User-Controlled Key.

Root Cause

The root cause is missing authorization validation on a user-controlled identifier. The function trusts the inbound user_id field instead of binding the update to the authenticated session or performing a capability check with WordPress current_user_can() logic. The plugin further relies on the attacker-supplied email as a weak secondary identifier, which is often publicly discoverable on WordPress sites.

Attack Vector

Exploitation occurs over the network against the WordPress AJAX endpoint. An attacker enumerates a target user ID (often sequential starting at 1 for administrators) and pairs it with the user's email address, which may be exposed through author pages, REST API endpoints, or public profiles. The attacker then submits an AJAX request to the profile update action with these values and a chosen password. On success, the attacker authenticates as the victim and inherits all assigned roles and capabilities.

The official patch is documented in the WordPress User Registration changeset 3268617, and the vulnerable code path is visible in the tagged 4.1.3 source. Additional analysis is available in the Wordfence Vulnerability Report.

Detection Methods for CVE-2025-3292

Indicators of Compromise

• Unexpected successful logins for administrator or editor accounts followed by configuration or content changes
• WordPress audit log entries showing password changes initiated through the user_registration_update_profile_details AJAX action against user IDs other than the requester's
• POST requests to /wp-admin/admin-ajax.php with the action=user_registration_update_profile_details parameter and mismatched user_id values
• Password reset notifications sent to legitimate users who did not request them

Detection Strategies

• Inspect webserver logs for AJAX requests to the vulnerable action parameter and correlate with the authenticated session's actual user ID
• Query the WordPress wp_users table for user_pass changes occurring outside normal administrative workflows
• Alert on repeated requests from a single source iterating through sequential user_id values

Monitoring Recommendations

• Enable a WordPress activity logging plugin to record profile and password modification events with originating IP and session identity
• Forward webserver and WordPress logs to a centralized analytics platform for correlation and retention
• Monitor for authentication from new geographies or user agents immediately after profile update AJAX calls

How to Mitigate CVE-2025-3292

Immediate Actions Required

• Update the User Registration & Membership plugin to a version newer than 4.1.3 that includes changeset 3268617
• Force a password reset for all administrator and privileged accounts on sites that ran a vulnerable version
• Audit WordPress user accounts for unauthorized role elevations or newly created administrators

Patch Information

WPEverest addressed the flaw in the plugin update tracked by WordPress plugin changeset 3268617. The fix adds validation that the user_id submitted in the AJAX request matches the authenticated session before applying profile or password changes.

Workarounds

• Disable the User Registration & Membership plugin until the patched release can be deployed
• Restrict access to /wp-admin/admin-ajax.php for the user_registration_update_profile_details action using a web application firewall rule
• Remove public exposure of user email addresses by disabling the WordPress REST /wp-json/wp/v2/users endpoint for unauthenticated requests

# Example WordPress REST API hardening in functions.php
add_filter( 'rest_endpoints', function( $endpoints ) {
    if ( isset( $endpoints['/wp/v2/users'] ) ) {
        unset( $endpoints['/wp/v2/users'] );
    }
    if ( isset( $endpoints['/wp/v2/users/(?P<id>[\d]+)'] ) ) {
        unset( $endpoints['/wp/v2/users/(?P<id>[\d]+)'] );
    }
    return $endpoints;
} );