CVE-2020-4046 Explained : Impact and Mitigation

In affected versions of WordPress, users with low privileges can inject unfiltered HTML using the embed block, potentially leading to script execution.

Understanding CVE-2020-4046

What is CVE-2020-4046?

In affected versions of WordPress, a vulnerability allows users with low privileges to inject unfiltered HTML via the embed block, potentially leading to script execution.

The Impact of CVE-2020-4046

This vulnerability could be exploited by users with low privileges to execute scripts in the editor/wp-admin when viewed by higher privileged users.

Technical Details of CVE-2020-4046

Vulnerability Description

Users with low privileges can exploit the embed block to inject unfiltered HTML, leading to potential script execution.

Affected Systems and Versions

WordPress versions >= 5.4.0, < 5.4.2
WordPress versions >= 5.3.0, < 5.3.4
WordPress versions >= 5.2.0, < 5.2.7
And other versions as listed in the description.

Exploitation Mechanism

The vulnerability allows users to misuse the embed block to insert malicious HTML code, which can execute scripts when viewed by higher privileged users.

Mitigation and Prevention

Immediate Steps to Take

Update WordPress to version 5.4.2 or the latest release.
Avoid granting unnecessary privileges to users.
Regularly monitor and review user permissions.

Long-Term Security Practices

Educate users on safe content creation practices.
Implement content moderation processes.
Conduct regular security audits and updates.

Patching and Updates

Ensure timely installation of security patches and updates provided by WordPress.