CVE-2025-68582

Executive Summary

CVE-2025-68582 is a Missing Authorization vulnerability in the Funnelforms Free WordPress plugin, affecting versions up to and including 3.8. This flaw allows unauthenticated attackers to exploit incorrectly configured access control security levels, potentially leading to unauthorized data exposure or manipulation. The vulnerability resides in the WordPress plugin ecosystem, specifically within the Funnelforms Free plugin, and does not involve Apache or Nginx server software.

The CVSS score of 5.3 (Medium) and EPSS score of 0.0% indicate low exploitation likelihood, but the lack of a patch and the nature of the vulnerability (missing authorization) make it a significant risk for sites using the plugin. No public proof-of-concept (PoC) or exploit code is available at this time.

Supply Chain & Package Security

This vulnerability affects a WordPress plugin distributed via the official WordPress plugin repository. Users should verify the integrity of their plugin files and monitor for updates. Since the plugin is not an NPM, PyPI, Go, or Ruby package, standard supply chain security measures for those ecosystems do not apply. However, WordPress site administrators should ensure they are using the latest version of the plugin and consider removing it if no patch is forthcoming.

CVSS Breakdown & Threat Level

• CVSS Score: 5.3 (Medium)
• Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
• Attack Vector: Network
• Attack Complexity: Low
• Privileges Required: None
• User Interaction: None
• Scope: Unchanged
• Confidentiality Impact: Low
• Integrity Impact: None
• Availability Impact: None

The threat level is Medium due to the low complexity and no required privileges, but the impact is limited to low confidentiality loss. The lack of a patch increases the risk for unpatched installations.

Deep Dive & Mechanics

The vulnerability is a Missing Authorization issue (CWE-862) in the Funnelforms Free plugin. The plugin likely fails to properly enforce access controls on certain AJAX actions or REST API endpoints, allowing unauthenticated users to access or modify data that should be restricted to authenticated users with specific roles.

The core issue is that the plugin does not check for user capabilities or nonces before executing sensitive operations. This could allow an attacker to:

• Retrieve form submissions or configuration data.
• Modify plugin settings.
• Access other users' data.

The vulnerability is triggered by sending crafted HTTP requests to the vulnerable endpoints without authentication. Since the plugin is unpatched, all versions up to 3.8 are affected.

Vulnerable vs. Patched Code

Since no patch is available, a comparison cannot be made. However, based on the vulnerability type, the patched code would likely include:

• Proper capability checks using current_user_can() or wp_verify_nonce().
• Implementation of WordPress nonces for form submissions.
• Restriction of AJAX handlers to authenticated users where appropriate.

Vulnerable code example (hypothetical):

add_action('wp_ajax_nopriv_funnelforms_get_data', 'funnelforms_get_data');
function funnelforms_get_data() {
    // No authorization check
    $data = get_option('funnelforms_data');
    echo json_encode($data);
    wp_die();
}

Patched code example (hypothetical):

add_action('wp_ajax_funnelforms_get_data', 'funnelforms_get_data');
function funnelforms_get_data() {
    if (!current_user_can('manage_options')) {
        wp_die('Unauthorized');
    }
    $data = get_option('funnelforms_data');
    echo json_encode($data);
    wp_die();
}

Exploitation & Lab Setup

Red Team

Objective: Exploit the missing authorization to retrieve sensitive data.

Lab Setup:

1. Install WordPress with Funnelforms Free version 3.8.
2. Create a test form and submit some data.
3. Use curl to send an unauthenticated request to the vulnerable endpoint.

Exploitation Steps:

1. Identify the vulnerable endpoint (e.g., /wp-admin/admin-ajax.php?action=funnelforms_get_data).
2. Send a GET request without any authentication:

   curl -X GET "http://target.com/wp-admin/admin-ajax.php?action=funnelforms_get_data"
   

3. If successful, the response will contain sensitive data (e.g., form submissions).

Note: No public exploit code is available, so this is a hypothetical scenario.

Blue Team

Objective: Detect and block exploitation attempts.

Detection Steps:

1. Monitor for unauthenticated requests to admin-ajax.php with suspicious actions.
2. Look for patterns like action=funnelforms_* in logs.
3. Implement Web Application Firewall (WAF) rules to block requests to unknown AJAX actions.

Hunting Query:

SELECT * FROM wp_actionscheduler_logs WHERE action LIKE '%funnelforms%' AND user_id = 0;

Indicators of Compromise (IOCs)

• Network IOCs:
  • HTTP requests to /wp-admin/admin-ajax.php with action parameter containing funnelforms.
  • Unauthenticated POST/GET requests to plugin-specific endpoints.
• File IOCs:
  • Modified plugin files in /wp-content/plugins/funnelforms-free/.
  • Unexpected files in the uploads directory.
• Log IOCs:
  • WordPress debug log entries showing unauthorized access attempts.
  • Web server logs with 200 responses to unauthenticated AJAX requests.

Detection Engineering

YARA Rule

rule CVE_2025_68582_Funnelforms_Missing_Auth {
    meta:
        description = "Detects Funnelforms Free plugin files with missing authorization"
        author = "Valters IT"
        date = "2025-04-10"
        reference = "CVE-2025-68582"
    strings:
        $vuln_func = "wp_ajax_nopriv_funnelforms" nocase
        $auth_check = "current_user_can" nocase
    condition:
        $vuln_func and not $auth_check
}

Sigma Rule

title: CVE-2025-68582 - Funnelforms Missing Authorization
id: 12345678-1234-1234-1234-123456789012
status: experimental
description: Detects unauthenticated access to Funnelforms AJAX endpoints
author: Valters IT
date: 2025-04-10
logsource:
    category: webserver
    product: apache
detection:
    selection:
        cs-method: 'GET'
        cs-uri-query|contains: 'action=funnelforms_'
        sc-status: 200
    condition: selection
falsepositives:
    - Legitimate plugin functionality if misconfigured
level: medium

Suricata Rule

alert http any any -> any any (msg:"CVE-2025-68582 Funnelforms Missing Authorization"; flow:to_server; content:"GET"; http_method; content:"/wp-admin/admin-ajax.php"; http_uri; content:"action=funnelforms_"; http_uri; classtype:attempted-recon; sid:1000001; rev:1;)

Remediation & Mitigation

Immediate Actions:

1. Disable the plugin if not essential, or remove it entirely.
2. Implement a Web Application Firewall (WAF) rule to block unauthenticated requests to admin-ajax.php with action parameters containing funnelforms.
3. Monitor logs for unauthorized access attempts.

Long-term Fix:

• Since no patch is available, consider switching to an alternative form plugin that is actively maintained.
• If the plugin is critical, contact the vendor for a patch or consider forking the plugin and adding proper authorization checks.

Workaround:

• Add the following code to your theme's functions.php to block unauthenticated AJAX requests for Funnelforms:

add_action('init', function() {
    if (defined('DOING_AJAX') && DOING_AJAX && !is_user_logged_in()) {
        $action = $_REQUEST['action'] ?? '';
        if (strpos($action, 'funnelforms_') === 0) {
            wp_die('Unauthorized');
        }
    }
});

Valters IT
Securing Digital Frontiers