CVE-2025-48282

Executive Summary

CVE-2025-48282 is a Missing Authorization vulnerability in the Majestic Support WordPress plugin (versions <= 1.1.0). This flaw allows an unauthenticated attacker to exploit incorrectly configured access control security levels, potentially leading to unauthorized access to sensitive support data or functionality. The vulnerability is classified as a WordPress ecosystem issue, not related to the underlying web server (Apache/Nginx). With a CVSS score of 5.3 (Medium), it poses a moderate risk, but the lack of a known patch and public exploit code increases the urgency for mitigation. The EPSS score is 0.0%, indicating low exploitation likelihood currently, but the vulnerability remains exploitable.

Supply Chain & Package Security

This vulnerability affects the Majestic Support WordPress plugin, which is distributed via the WordPress plugin repository and third-party marketplaces. Organizations using this plugin should treat it as a supply chain risk, as the vendor has not released a patch. The plugin may be bundled in WordPress themes or custom deployments, increasing the attack surface.

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. The vulnerability is easy to exploit but only leads to limited information disclosure. However, in the context of a WordPress site, this could expose support tickets, user data, or internal notes.

Deep Dive & Mechanics

The vulnerability stems from Missing Authorization (CWE-862) in the Majestic Support plugin. The plugin fails to properly enforce access control checks on certain AJAX actions or REST endpoints, allowing unauthenticated users to invoke privileged functions. Specifically, the plugin likely registers WordPress AJAX hooks without verifying user capabilities (e.g., wp_ajax_nopriv_* handlers that should require authentication). An attacker can send crafted HTTP requests to these endpoints to retrieve support data, modify settings, or access other restricted functionality.

The affected version range is <= 1.1.0. The plugin’s code likely uses add_action('wp_ajax_nopriv_my_action', ...) without a corresponding capability check, or uses current_user_can() incorrectly. The exact vulnerable endpoint is not publicly documented, but common patterns include admin-ajax.php actions like majestic_support_get_tickets or majestic_support_export_data.

Vulnerable vs. Patched Code

Since no patch is available, the following is a hypothetical comparison based on common fixes for missing authorization vulnerabilities.

Vulnerable Code (hypothetical):

add_action('wp_ajax_nopriv_majestic_get_tickets', 'majestic_get_tickets');
function majestic_get_tickets() {
    // No capability check
    $tickets = get_posts(array('post_type' => 'majestic_ticket'));
    wp_send_json($tickets);
}

Patched Code (hypothetical):

add_action('wp_ajax_majestic_get_tickets', 'majestic_get_tickets');
add_action('wp_ajax_nopriv_majestic_get_tickets', function() {
    wp_die('Unauthorized', 401);
});
function majestic_get_tickets() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized', 401);
    }
    $tickets = get_posts(array('post_type' => 'majestic_ticket'));
    wp_send_json($tickets);
}

The fix involves removing the nopriv handler (which allows unauthenticated access) and adding a capability check inside the function.

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site with Majestic Support plugin version <= 1.1.0 installed and activated.
• Knowledge of the vulnerable endpoint (e.g., admin-ajax.php?action=majestic_support_get_data).

Exploitation Steps:

1. Identify the vulnerable AJAX action by analyzing the plugin’s JavaScript or PHP files (e.g., look for wp_ajax_nopriv_* hooks).
2. Send a crafted HTTP request to the WordPress admin-ajax.php endpoint:

   curl -X POST "http://target.com/wp-admin/admin-ajax.php" \
        -d "action=majestic_support_get_tickets" \
        -H "Content-Type: application/x-www-form-urlencoded"
   

3. If successful, the response will contain sensitive data (e.g., support tickets, user emails) in JSON format.

Automation with Nuclei (if template were available):

id: majestic-support-missing-auth
info:
  name: Majestic Support Missing Authorization
  severity: medium
  description: Detects missing authorization in Majestic Support plugin
requests:
  - method: POST
    path:
      - "{{BaseURL}}/wp-admin/admin-ajax.php"
    body: "action=majestic_support_get_tickets"
    matchers:
      - type: word
        words:
          - "post_title"
          - "ticket_id"

Blue Team

Detection:

• Monitor for unusual POST requests to /wp-admin/admin-ajax.php with unknown or suspicious action parameters.
• Look for spikes in 200 OK responses from admin-ajax.php without a valid session cookie.
• Use the Sigma rule below to detect exploitation attempts.

Hunting:

• Search web server logs for requests containing action=majestic_support_ or similar patterns.
• Check for unauthorized access to custom post types (e.g., majestic_ticket).

Indicators of Compromise (IOCs)

• Network IOCs:
  • POST requests to /wp-admin/admin-ajax.php with action=majestic_support_* parameters.
  • Unusual JSON responses containing support ticket data from unauthenticated sources.
• File IOCs:
  • Presence of the Majestic Support plugin in /wp-content/plugins/majestic-support/ with version <= 1.1.0.
• Log IOCs:
  • Web server logs showing 200 responses to admin-ajax.php from IPs without prior authentication.

Detection Engineering

YARA Rule

rule majestic_support_missing_auth {
    meta:
        description = "Detects Majestic Support plugin files with missing authorization"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-48282"
    strings:
        $vuln_func = "wp_ajax_nopriv_" nocase
        $vuln_action = "majestic_support" nocase
    condition:
        $vuln_func and $vuln_action
}

Sigma Rule

title: Majestic Support Missing Authorization Exploitation
id: 8a4b3c2d-1e5f-6a7b-8c9d-0e1f2a3b4c5d
status: experimental
description: Detects exploitation attempts of CVE-2025-48282
author: Valters IT
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=majestic_support_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: medium

Suricata Rule

alert http any any -> any any (
    msg:"CVE-2025-48282 - Majestic Support Missing Authorization Exploitation";
    flow:to_server,established;
    content:"POST"; http_method;
    content:"/wp-admin/admin-ajax.php"; http_uri;
    content:"action=majestic_support_"; http_client_body;
    classtype:attempted-recon;
    sid:1000001;
    rev:1;
)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if not essential for business operations.
2. Implement a Web Application Firewall (WAF) rule to block requests to admin-ajax.php with action=majestic_support_* parameters from unauthenticated users.
3. Restrict access to /wp-admin/ directory using IP whitelisting or .htaccess authentication.

Long-term Fix:

• Since no official patch exists, consider forking the plugin and applying the fix described in the "Vulnerable vs. Patched Code" section.
• Monitor the vendor’s website for updates and apply patches as soon as they become available.
• Conduct a security audit of all WordPress plugins to identify similar missing authorization issues.

Valters IT – Securing digital ecosystems through proactive threat intelligence.