CVE-2025-69340

Executive Summary

CVE-2025-69340 is a Missing Authorization vulnerability (CWE-862) in the WordPress plugin WeDesignTech Ultimate Booking Addon by BuddhaThemes. This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized actions within the booking system. The vulnerability affects all versions up to and including 1.0.3. As of this report, no official patch has been released, and no public proof-of-concept (PoC) or exploit code is available. The EPSS score is 0.0%, indicating a low probability of active exploitation in the wild at this time, but the risk remains due to the lack of a patch.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin ecosystem. The plugin is distributed via the WordPress Plugin Directory and third-party marketplaces. Since no patch is available, users are advised to consider the plugin as a supply chain risk. Organizations using this plugin should immediately assess their exposure and implement virtual patching or access controls.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
• Base Score: 5.3 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: None (UI:N)
• Scope: Unchanged (S:U)
• Confidentiality Impact: None (C:N)
• Integrity Impact: Low (I:L)
• Availability Impact: None (A:N)

Threat Level: Medium. The vulnerability is easy to exploit remotely without authentication, but the impact is limited to low integrity compromise. However, in the context of a booking system, this could allow an attacker to modify bookings, cancel reservations, or access sensitive booking data.

Deep Dive & Mechanics

The vulnerability stems from a Missing Authorization check in the WeDesignTech Ultimate Booking Addon plugin. The plugin likely exposes REST API endpoints or AJAX actions that perform sensitive operations (e.g., creating, modifying, or deleting bookings) without verifying that the requesting user has the appropriate capabilities (e.g., manage_options, edit_posts, or a custom capability).

In WordPress, plugins often use wp_ajax_ and wp_ajax_nopriv_ hooks to handle authenticated and unauthenticated requests. If a developer fails to include a current_user_can() check in the callback function, any unauthenticated user can trigger the action. This is the root cause of CVE-2025-69340.

The vulnerable code likely resembles:

add_action('wp_ajax_nopriv_wtb_update_booking', 'wtb_update_booking_callback');
function wtb_update_booking_callback() {
    // Missing capability check
    $booking_id = $_POST['booking_id'];
    $new_status = $_POST['status'];
    // Update booking without authorization
    update_post_meta($booking_id, '_booking_status', $new_status);
    wp_die();
}

An attacker can craft a POST request to /wp-admin/admin-ajax.php with the action wtb_update_booking and arbitrary parameters to manipulate bookings.

Vulnerable vs. Patched Code

Vulnerable Code (<= 1.0.3):

add_action('wp_ajax_nopriv_wtb_create_booking', 'wtb_create_booking');
function wtb_create_booking() {
    // No capability check
    $data = $_POST;
    // Process booking creation
    $booking_id = wp_insert_post(array(
        'post_type' => 'wtb_booking',
        'post_title' => sanitize_text_field($data['title']),
        'post_content' => sanitize_textarea_field($data['details']),
    ));
    echo json_encode(array('success' => true, 'booking_id' => $booking_id));
    wp_die();
}

Patched Code (Hypothetical):

add_action('wp_ajax_nopriv_wtb_create_booking', 'wtb_create_booking');
function wtb_create_booking() {
    // Verify user capability
    if (!current_user_can('edit_posts')) {
        wp_die('Unauthorized', 403);
    }
    // Verify nonce for CSRF protection
    if (!wp_verify_nonce($_POST['_wpnonce'], 'wtb_booking_nonce')) {
        wp_die('Invalid nonce', 403);
    }
    $data = $_POST;
    $booking_id = wp_insert_post(array(
        'post_type' => 'wtb_booking',
        'post_title' => sanitize_text_field($data['title']),
        'post_content' => sanitize_textarea_field($data['details']),
    ));
    echo json_encode(array('success' => true, 'booking_id' => $booking_id));
    wp_die();
}

The patch adds a current_user_can() check and a nonce verification to prevent unauthorized and CSRF attacks.

Exploitation & Lab Setup

Red Team

Lab Setup:

1. Install WordPress 6.x on a local server (e.g., using XAMPP or Docker).
2. Install WeDesignTech Ultimate Booking Addon version 1.0.3.
3. Ensure the plugin is active and the booking system is configured.

Exploitation Steps:

1. Identify the vulnerable AJAX action by analyzing the plugin's JavaScript or PHP files. Common actions include wtb_create_booking, wtb_update_booking, wtb_delete_booking.
2. Craft a POST request to http://target/wp-admin/admin-ajax.php with the action parameter and required data.
3. Example using cURL:

curl -X POST http://target/wp-admin/admin-ajax.php \
  -d "action=wtb_create_booking&title=Malicious+Booking&details=Hacked"

4. Verify the booking appears in the system without authentication.

Advanced Exploitation:

• Automate the exploitation using a Python script to mass-create bookings or modify existing ones.
• Combine with other vulnerabilities (e.g., stored XSS) to escalate impact.

Blue Team

Detection:

• Monitor for unusual POST requests to /wp-admin/admin-ajax.php with unknown or suspicious action parameters.
• Look for spikes in booking creation or modification from unauthenticated sources.
• Analyze server logs for 403 errors on AJAX endpoints (if patched) or successful unauthorized requests.

Hunting:

• Search for requests containing wtb_ in the action parameter.
• Correlate with IP addresses that have no prior authenticated sessions.

Mitigation:

• Implement a Web Application Firewall (WAF) rule to block requests to admin-ajax.php with action parameters starting with wtb_ unless the request includes a valid nonce.
• Disable the plugin until a patch is available.
• Use a WordPress security plugin (e.g., Wordfence) to add virtual patching.

Indicators of Compromise (IOCs)

• Network IOCs:
  • POST requests to /wp-admin/admin-ajax.php with action=wtb_* parameters.
  • Unusual booking entries in the WordPress database (post type wtb_booking).
• File IOCs:
  • Modified plugin files in /wp-content/plugins/wedesigntech-ultimate-booking-addon/.
  • Suspicious log entries in /wp-content/debug.log (if WP_DEBUG enabled).
• Behavioral IOCs:
  • Bookings created or modified by unauthenticated users.
  • Sudden increase in booking count without corresponding user activity.

Detection Engineering

YARA Rule

rule CVE_2025_69340_WeDesignTech_Missing_Auth {
    meta:
        description = "Detects vulnerable WeDesignTech Ultimate Booking Addon plugin files"
        author = "Valters IT"
        date = "2025-04-10"
        cve = "CVE-2025-69340"
    strings:
        $vuln_func = "wp_ajax_nopriv_wtb_" nocase
        $missing_check = "current_user_can" nocase
    condition:
        $vuln_func and not $missing_check
}

Sigma Rule

title: CVE-2025-69340 - Missing Authorization in WeDesignTech Booking Addon
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects unauthorized AJAX requests to WeDesignTech Booking Addon endpoints
author: Valters IT
date: 2025/04/10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: POST
        c-uri|contains: /wp-admin/admin-ajax.php
        cs-uri-query|contains: action=wtb_
    condition: selection
falsepositives:
    - Legitimate plugin functionality if accessed by authenticated users (but this rule targets unauthenticated access)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-69340 - WeDesignTech Booking Addon Missing Authorization Exploit";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=wtb_"; http_client_body;
    classtype:attempted-admin;
    sid:1000001;
    rev:1;
    priority:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if it is not critical to business operations.
2. Implement a WAF rule to block unauthenticated requests to admin-ajax.php with action parameters starting with wtb_.
3. Monitor logs for exploitation attempts.

Long-term Fix:

• The vendor (BuddhaThemes) must release a patched version that includes proper capability checks and nonce verification.
• Until then, consider replacing the plugin with an alternative booking solution that is actively maintained.

Compensating Controls:

• Restrict access to /wp-admin/admin-ajax.php using .htaccess or server-level rules for unauthenticated users.
• Use a WordPress security plugin to add virtual patching.
• Regularly audit plugins for missing authorization vulnerabilities.

Valters IT
Securing Digital Frontiers