CVE-2021-4383 – The WP Quick FrontEnd Editor plugin for WordPre... (How to Fix)

Q: What is the severity of CVE-2021-4383?

CVE-2021-4383 has a CVSS score of 8.1 (HIGH). The WP Quick FrontEnd Editor plugin for WordPress has a missing capability check vulnerability that allows low-privileged authenticated users (like subscribers) to edit or create any page or post. This affects versions up to and including 5.5. Attackers can modify website content without proper authorization.

📋 TL;DR

The WP Quick FrontEnd Editor plugin for WordPress has a missing capability check vulnerability that allows low-privileged authenticated users (like subscribers) to edit or create any page or post. This affects versions up to and including 5.5. Attackers can modify website content without proper authorization.

💻 Affected Systems

Products:

WordPress WP Quick FrontEnd Editor plugin

Versions: Up to and including version 5.5

Operating Systems: Any OS running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires WordPress installation with the vulnerable plugin enabled and at least one low-privileged user account.

📦 What is this software?

Wp Quick Frontend Editor by Webdevocean

View all CVEs affecting Wp Quick Frontend Editor →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Attackers could deface the entire website, inject malicious content, redirect users to phishing sites, or compromise the WordPress installation by modifying critical pages.

🟠

Likely Case

Unauthorized content modification leading to defacement, SEO spam injection, or insertion of malicious scripts that affect visitors.

🟢

If Mitigated

With proper user role management and monitoring, impact is limited to content integrity issues that can be detected and reverted.

🌐 Internet-Facing: HIGH

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ⚠️ Yes

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access but is simple to execute. Public proof-of-concept exists in security advisories.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: None

Vendor Advisory: https://wordpress.org/plugins/wp-quick-front-end-editor/#developers

Restart Required: No

Instructions:

1. Remove the WP Quick FrontEnd Editor plugin entirely. 2. Delete plugin files from /wp-content/plugins/wp-quick-front-end-editor/. 3. Verify no residual files remain.

🔧 Temporary Workarounds

Disable plugin

all

Deactivate the vulnerable plugin through WordPress admin panel

wp plugin deactivate wp-quick-front-end-editor

Restrict user roles

all

Temporarily restrict subscriber and contributor roles from accessing editing functions

🧯 If You Can't Patch

Remove all low-privileged user accounts until plugin is removed
Implement strict content monitoring and revision tracking

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin > Plugins page for WP Quick FrontEnd Editor version 5.5 or lower

Check Version:

wp plugin get wp-quick-front-end-editor --field=version

Verify Fix Applied:

Confirm plugin is either removed or updated to a version above 5.5 (though no patched version exists)

📡 Detection & Monitoring

Log Indicators:

Unusual POST requests to page editing endpoints from low-privileged users
Content modifications from subscriber-level accounts

Network Indicators:

HTTP POST requests to /wp-admin/admin-ajax.php with editing actions from unauthorized users

SIEM Query:

source="wordpress.log" AND ("action=edit_page" OR "action=save_post") AND user_role="subscriber"

📊 Metadata

CVE ID: CVE-2021-4383

CVSS v3 Score: 8.1 (HIGH)

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

CWE: CWE-862

Published: June 7, 2023

Last Updated: November 21, 2024

🔗 References

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🔗 Related Vulnerabilities

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