CVE-2025-14358

Executive Summary

CVE-2025-14358 is a Missing Authorization vulnerability in the REHub Framework WordPress plugin (slug: rehub-framework) developed by Sizam. This flaw allows unauthenticated attackers to access functionality that should be constrained by Access Control Lists (ACLs). The vulnerability affects all versions from n/a through 19.9.5.

The core issue lies in the plugin’s failure to properly enforce permission checks on certain AJAX actions or REST endpoints. An attacker can exploit this to read sensitive data, modify settings, or perform privileged operations without any authentication. Given the CVSS score of 7.5 (High) and the lack of a known patch, this poses a significant risk to WordPress sites using the REHub Framework.

Supply Chain & Package Security

This vulnerability is specific to the WordPress plugin ecosystem. The REHub Framework is distributed via the official WordPress plugin repository and commercial marketplaces. Users should verify the integrity of their plugin files and monitor for updates from the vendor. No known supply chain compromise has been reported, but the unpatched status increases the risk of malicious actors injecting backdoors through this vector.

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) – The vulnerable component remains the same.
• Confidentiality (C): High (H) – Full read access to sensitive data.
• Integrity (I): None (N) – No write capability confirmed.
• Availability (A): None (N) – No denial of service.

Threat Level: High. The combination of network exploitability, no privileges required, and high confidentiality impact makes this a critical risk for unpatched installations.

Deep Dive & Mechanics

The REHub Framework is a multi-purpose WordPress theme framework that provides extensive AJAX functionality for user interactions, product searches, and admin operations. The vulnerability stems from missing current_user_can() or wp_nonce_verify() checks in one or more AJAX handlers.

Root Cause Analysis:

1. The plugin registers AJAX actions for both authenticated and unauthenticated users.
2. Some actions intended for administrators or shop managers lack capability checks.
3. An attacker can craft a direct HTTP request to wp-admin/admin-ajax.php with the appropriate action parameter.
4. The server processes the request without verifying the user’s role, exposing sensitive data or functionality.

Potential Attack Vectors:

• Data Exfiltration: Accessing user lists, order details, or configuration data.
• Privilege Escalation: Modifying user roles or plugin settings.
• Information Disclosure: Leaking database credentials or API keys stored in options.

Vulnerable vs. Patched Code

Since no official patch is available, the following is a hypothetical comparison based on common WordPress security practices.

Vulnerable Code (rehub-framework/includes/ajax.php):

add_action('wp_ajax_nopriv_rehub_get_sensitive_data', 'rehub_get_sensitive_data');
function rehub_get_sensitive_data() {
    // Missing capability check
    $data = get_option('rehub_secret_config');
    wp_send_json_success($data);
}

Patched Code (Hypothetical):

add_action('wp_ajax_nopriv_rehub_get_sensitive_data', 'rehub_get_sensitive_data');
function rehub_get_sensitive_data() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 403);
    }
    $data = get_option('rehub_secret_config');
    wp_send_json_success($data);
}

The patch adds a current_user_can('manage_options') check to restrict access to administrators only.

Exploitation & Lab Setup

Red Team (Exploitation)

Prerequisites:

• Target WordPress site with REHub Framework <= 19.9.5.
• Network access to the target.

Exploitation Steps:

1. Identify vulnerable AJAX actions by analyzing the plugin’s JavaScript files or source code.
2. Craft a POST request to wp-admin/admin-ajax.php with the vulnerable action.
3. Parse the JSON response for sensitive data.

Example Exploit (cURL):

curl -X POST https://target.com/wp-admin/admin-ajax.php \
  -d "action=rehub_get_sensitive_data"

Expected Response:

{"success":true,"data":{"secret_key":"abc123","db_password":"pass123"}}

Blue Team (Detection & Hardening)

Detection:

• Monitor wp-admin/admin-ajax.php requests for unusual action parameters.
• Look for requests from unauthenticated users to actions that should require authentication.
• Use Web Application Firewall (WAF) rules to block known vulnerable actions.

Hardening:

• Apply the principle of least privilege to all AJAX handlers.
• Implement a virtual patch by adding capability checks via a custom plugin or mu-plugin.
• Disable the plugin if no patch is available and the functionality is not critical.

Virtual Patch Code (mu-plugin):

add_action('init', function() {
    if (defined('DOING_AJAX') && DOING_AJAX) {
        $action = $_REQUEST['action'] ?? '';
        $restricted_actions = ['rehub_get_sensitive_data', 'rehub_admin_action'];
        if (in_array($action, $restricted_actions) && !current_user_can('manage_options')) {
            wp_die('Access denied', 403);
        }
    }
});

Indicators of Compromise (IOCs)

Network IOCs:

• POST requests to /wp-admin/admin-ajax.php with action=rehub_* parameters from unauthenticated sources.
• Unusual JSON responses containing configuration data or user lists.

File IOCs:

• Modified rehub-framework/includes/ajax.php or similar files.
• Presence of unknown admin users created via the vulnerability.

Log IOCs:

• Repeated 200 responses to admin-ajax.php from the same IP without prior authentication.
• Error logs showing wp_die or 403 responses after virtual patching.

Detection Engineering

YARA Rule

rule CVE_2025_14358_REHub_Missing_Auth {
    meta:
        description = "Detects vulnerable REHub Framework AJAX handlers"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-14358"
    strings:
        $ajax_handler = /add_action\s*\(\s*['\"]wp_ajax_nopriv_rehub_/
        $missing_check = /wp_send_json/
    condition:
        $ajax_handler and not $missing_check
}

Sigma Rule

title: CVE-2025-14358 REHub Missing Authorization Exploitation
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated access to REHub AJAX actions
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-ajax.php'
        cs-uri-query|re: 'action=rehub_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate AJAX calls from authenticated users (rare)
level: high

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"CVE-2025-14358 REHub Missing Authorization Exploitation";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=rehub_"; http_client_body;
    classtype:attempted-recon;
    sid:10000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if it is not essential for business operations.
2. Apply a virtual patch using the mu-plugin code provided in the Blue Team section.
3. Monitor logs for exploitation attempts and block offending IPs.

Long-term Fix:

• Await an official patch from Sizam. Contact the vendor for an ETA.
• If the plugin is abandoned, consider migrating to an alternative framework.
• Implement a Web Application Firewall (WAF) with rules to block unauthenticated AJAX requests to known vulnerable actions.

Workaround:

• Restrict access to wp-admin/admin-ajax.php via .htaccess for unauthenticated users, but this may break legitimate functionality.

Valters IT