CVE-2024-5489 – The Wbcom Designs Custom Font Uploader WordPres... (How to Fix)

📋 TL;DR

The Wbcom Designs Custom Font Uploader WordPress plugin has an authorization vulnerability that allows authenticated users with Subscriber-level access or higher to delete any custom font. This affects all WordPress sites using plugin versions up to 2.3.4. The vulnerability stems from a missing capability check in the font deletion function.

💻 Affected Systems

Products:

Wbcom Designs Custom Font Uploader WordPress Plugin

Versions: All versions up to and including 2.3.4

Operating Systems: All operating systems running WordPress

Default Config Vulnerable: ⚠️ Yes

Notes: Requires WordPress installation with the vulnerable plugin enabled. Any authenticated user (Subscriber role or higher) can exploit this.

📦 What is this software?

Custom Font Uploader by Wbcomdesigns

View all CVEs affecting Custom Font Uploader →

⚠️ Risk & Real-World Impact

🔴

Worst Case

Malicious authenticated users could delete all custom fonts, disrupting website typography and branding, potentially causing site functionality issues if fonts are critical to design.

🟠

Likely Case

Low-privilege users deleting fonts they shouldn't have access to, causing minor design disruptions that require administrator intervention to restore.

🟢

If Mitigated

No impact if proper user role management and access controls are implemented, or if the vulnerability is patched.

🌐 Internet-Facing: MEDIUM

🏢 Internal Only: LOW

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: LIKELY

Unauthenticated Exploit: ✅ No

Complexity: LOW

Exploitation requires authenticated access but is technically simple - just calling the vulnerable function without proper authorization checks.

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: 2.3.5

Vendor Advisory: https://plugins.trac.wordpress.org/changeset/3097373/

Restart Required: No

Instructions:

1. Log into WordPress admin panel
2. Navigate to Plugins → Installed Plugins
3. Find 'Custom Font Uploader'
4. Click 'Update Now' if update is available
5. Alternatively, download version 2.3.5+ from WordPress plugin repository
6. Deactivate, delete old version, upload and activate new version

🔧 Temporary Workarounds

Disable Plugin

all

Temporarily disable the vulnerable plugin until patched

wp plugin deactivate custom-font-uploader

Remove Subscriber Delete Capability

all

Use a role management plugin to remove font deletion capabilities from low-privilege roles

🧯 If You Can't Patch

Disable the Custom Font Uploader plugin entirely
Implement strict user role management and monitor for suspicious font deletion activities

🔍 How to Verify

Check if Vulnerable:

Check WordPress admin → Plugins → Custom Font Uploader → Version. If version is 2.3.4 or lower, you are vulnerable.

Check Version:

wp plugin get custom-font-uploader --field=version

Verify Fix Applied:

After updating, verify plugin version shows 2.3.5 or higher in WordPress admin plugins page.

📡 Detection & Monitoring

Log Indicators:

WordPress audit logs showing font deletion by non-administrator users
Plugin-specific logs showing font removal actions

Network Indicators:

POST requests to WordPress admin-ajax.php or admin-post.php with font deletion parameters

SIEM Query:

source="wordpress" AND (action="delete_font" OR plugin="custom-font-uploader") AND user_role!="administrator"

📊 Metadata

CVE ID: CVE-2024-5489

CVSS v3 Score: 4.3 (MEDIUM)

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

CWE: CWE-862

Published: June 6, 2024

Last Updated: November 21, 2024

🔗 References

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