CVE-2025-69336

Executive Summary

CVE-2025-69336 is a Missing Authorization vulnerability (CWE-862) in the Ultimate Store Kit Elementor Addons WordPress plugin, developed by Bdthemes. This flaw affects all versions up to and including 2.9.4. The vulnerability allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to sensitive data or functionality. Given the plugin's integration with Elementor, a widely used page builder, the attack surface is significant. The CVSS score of 4.3 (Medium) reflects the low complexity and network-based attack vector, though the impact is limited to confidentiality. No public proof-of-concept (PoC) or patch details are currently available, but the vulnerability is considered exploitable due to the nature of missing authorization checks in WordPress plugins.

WordPress Ecosystem Context

This vulnerability is specific to the WordPress plugin ecosystem. The Ultimate Store Kit plugin extends Elementor with e-commerce widgets, and the missing authorization flaw likely resides in an AJAX handler or REST endpoint that fails to verify user capabilities. Attackers can exploit this without authentication, potentially accessing order data, customer information, or administrative functions.

CVSS Breakdown & Threat Level

• Attack Vector (AV): Network (N) – Exploitable remotely.
• Attack Complexity (AC): Low (L) – No special conditions required.
• Privileges Required (PR): None (N) – No authentication needed.
• User Interaction (UI): None (N) – No user action required.
• Scope (S): Unchanged (U) – Vulnerability does not affect other components.
• Confidentiality (C): Low (L) – Limited data exposure.
• Integrity (I): None (N) – No data modification.
• Availability (A): None (N) – No denial of service.

Threat Level: Medium. While the CVSS score is 4.3, the lack of required privileges and network exploitability increases the risk in real-world scenarios, especially for sites handling sensitive e-commerce data.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the plugin's AJAX actions or REST API endpoints. In WordPress, plugins often register AJAX hooks for both authenticated and unauthenticated users. If a developer fails to implement proper capability checks (e.g., current_user_can()), an unauthenticated attacker can trigger privileged actions.

Root Cause: The ultimate-store-kit plugin likely registers an AJAX action without verifying the user's role or capabilities. For example, an endpoint meant for administrators to retrieve order logs might be accessible to anyone.

Attack Flow:

1. Attacker identifies the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=usk_get_orders).
2. Sends a crafted request with no authentication.
3. Server processes the request and returns sensitive data (e.g., customer names, addresses, payment details).

Impact: Unauthorized disclosure of e-commerce data, potentially leading to privacy breaches or further attacks (e.g., social engineering).

Vulnerable vs. Patched Code

Since no patch is available, we hypothesize the vulnerable code pattern:

Vulnerable Code (hypothetical):

add_action('wp_ajax_nopriv_usk_get_orders', 'usk_get_orders');
function usk_get_orders() {
    // Missing capability check
    $orders = get_posts(array('post_type' => 'shop_order', 'numberposts' => -1));
    wp_send_json($orders);
}

Patched Code (expected):

add_action('wp_ajax_nopriv_usk_get_orders', 'usk_get_orders');
function usk_get_orders() {
    if (!current_user_can('manage_woocommerce')) {
        wp_die('Unauthorized', 403);
    }
    $orders = get_posts(array('post_type' => 'shop_order', 'numberposts' => -1));
    wp_send_json($orders);
}

Exploitation & Lab Setup

Red Team (Offensive)

Prerequisites:

• Target WordPress site with Ultimate Store Kit <= 2.9.4.
• Knowledge of the vulnerable endpoint (requires reconnaissance).

Exploitation Steps:

1. Enumerate AJAX actions using a tool like WPScan or manual inspection.
2. Identify the vulnerable action (e.g., usk_export_data).
3. Send a crafted request:

curl -X POST http://target.com/wp-admin/admin-ajax.php \
  -d "action=usk_export_data&type=orders"

4. Parse the JSON response for sensitive data.

Automation Script (Python):

import requests

target = "http://target.com/wp-admin/admin-ajax.php"
data = {"action": "usk_export_data", "type": "orders"}
response = requests.post(target, data=data)
if response.status_code == 200:
    print(response.json())

Blue Team (Defensive)

Detection:

• Monitor for unusual AJAX requests to admin-ajax.php with unknown actions.
• Look for requests without a valid X-WP-Nonce header.
• Alert on high volume of requests to plugin-specific endpoints.

Honeypot:

• Deploy a fake endpoint mimicking the vulnerable action to trap attackers.

Indicators of Compromise (IOCs)

• Network:
  • POST requests to /wp-admin/admin-ajax.php with action=usk_* parameters.
  • Unusual JSON responses containing order data.
• File:
  • Modified or new files in /wp-content/plugins/ultimate-store-kit/.
• Logs:
  • WordPress debug logs showing wp_ajax_nopriv_usk_* calls.
  • Web server logs with 200 responses to AJAX endpoints from unknown IPs.

Detection Engineering

YARA Rule

rule CVE_2025_69336_Ultimate_Store_Kit {
    meta:
        description = "Detects exploitation attempts for CVE-2025-69336"
        author = "Valters IT"
        date = "2025-04-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-69336"
    strings:
        $ajax_action = "action=usk_" ascii wide nocase
        $admin_ajax = "admin-ajax.php" ascii wide nocase
    condition:
        $ajax_action and $admin_ajax
}

Sigma Rule

title: CVE-2025-69336 - Missing Authorization in Ultimate Store Kit
id: 8a4b3c2d-1e5f-4a7b-9c8d-0e1f2a3b4c5d
status: experimental
description: Detects unauthorized AJAX requests targeting Ultimate Store Kit plugin
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|contains: 'action=usk_'
    condition: selection
falsepositives:
    - Legitimate admin actions
level: medium

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"CVE-2025-69336 - Ultimate Store Kit Missing Authorization";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"admin-ajax.php"; http_uri;
    content:"action=usk_"; http_client_body;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released.
2. Implement a Web Application Firewall (WAF) rule to block requests containing action=usk_ in POST bodies to admin-ajax.php.
3. Restrict access to /wp-admin/admin-ajax.php via .htaccess for non-admin IPs.

Long-term Fix:

• Apply the vendor's patch once available (monitor Bdthemes' update channel).
• Conduct a code review of all AJAX handlers to ensure proper capability checks.

Workaround:

• Add a custom function to your theme's functions.php to validate nonces:

add_action('wp_ajax_nopriv_usk_*', function() {
    wp_die('Unauthorized', 403);
}, 1);

Valters IT
Securing Digital Frontiers