CVE-2024-4709 – This vulnerability allows authenticated WordPre... (How to Fix)

Q: What is the severity of CVE-2024-4709?

CVE-2024-4709 has a CVSS score of 7.2 (HIGH). This vulnerability allows authenticated WordPress users with contributor-level permissions or higher to inject malicious scripts into website pages via the 'subject' parameter in the Fluent Forms plugin. The injected scripts execute whenever users visit the compromised pages, enabling attackers to steal session cookies, redirect users, or deface websites. All WordPress sites using vulnerable versions of the Fluent Forms plugin are affected.

📋 TL;DR

This vulnerability allows authenticated WordPress users with contributor-level permissions or higher to inject malicious scripts into website pages via the 'subject' parameter in the Fluent Forms plugin. The injected scripts execute whenever users visit the compromised pages, enabling attackers to steal session cookies, redirect users, or deface websites. All WordPress sites using vulnerable versions of the Fluent Forms plugin are affected.

💻 Affected Systems

Products:

Fluent Forms - Contact Form, Quiz, Survey, and Drag & Drop WP Form Builder for WordPress

Versions: Up to and including 5.1.16

Operating Systems: Any OS running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires WordPress installation with Fluent Forms plugin and at least one user with contributor-level permissions or higher.

📦 What is this software?

Contact Form by Fluentforms

View all CVEs affecting Contact Form →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could steal administrator credentials, take over the WordPress site, install backdoors, or redirect all visitors to malicious sites, potentially leading to complete site compromise and data theft.

🟠

Likely Case

Attackers with contributor access inject malicious scripts to steal user session cookies, redirect users to phishing pages, or deface specific pages of the website.

🟢

If Mitigated

With proper user role management and input validation, the risk is limited to trusted contributors who would need to be compromised first.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access with at least contributor permissions. The vulnerability is in the email notification functionality where subject parameter input is not properly sanitized.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 5.1.17

Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3088078/

Restart Required: No

Instructions:

1. Log into WordPress admin panel. 2. Navigate to Plugins → Installed Plugins. 3. Find 'Fluent Forms' and check if update is available. 4. Click 'Update Now' to upgrade to version 5.1.17 or higher. 5. Verify the update completed successfully.

🔧 Temporary Workarounds

Temporary Input Sanitization

all

Add custom input sanitization for the subject parameter in theme functions.php

Add to theme's functions.php: add_filter('fluentform_email_subject', 'sanitize_text_field');

Restrict User Roles

all

Temporarily remove contributor-level permissions from untrusted users

Navigate to Users → All Users in WordPress admin, edit user roles to remove contributor access

🧯 If You Can't Patch

Disable the Fluent Forms plugin completely until patching is possible
Implement strict Content Security Policy (CSP) headers to mitigate XSS impact

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin → Plugins → Installed Plugins, find Fluent Forms and verify version is 5.1.16 or lower

Check Version:

wp plugin list --name='Fluent Forms' --field=version (if WP-CLI installed)

Verify Fix Applied:

After updating, verify Fluent Forms version shows 5.1.17 or higher in WordPress plugins list

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests to /wp-admin/admin-ajax.php with 'subject' parameter containing script tags
Multiple form submissions from same contributor user with unusual subject content

Network Indicators:

Outbound connections to suspicious domains from your WordPress site after form submissions

SIEM Query:

source="wordpress.log" AND "subject=" AND ("<script>" OR "javascript:" OR "onload=" OR "onerror=")

📊 Metadata

CVE ID: CVE-2024-4709

CVSS v3 Score: 7.2 (HIGH)

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CWE: CWE-79

Published: May 18, 2024

Last Updated: February 6, 2025

🔗 References

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