CVE-2021-24960 : What You Need to Know

WordPress File Upload < 4.16.3 - Contributor+ Stored Cross-Site Scripting via Malicious SVG

Understanding CVE-2021-24960

This CVE identifies a vulnerability in the WordPress File Upload plugin versions prior to 4.16.3 and wordpress-file-upload-pro plugin versions prior to 4.16.3. It allows users with a role as low as Contributor to configure the upload form in a way that permits the uploading of SVG files, leading to potential Cross-Site Scripting (XSS) attacks.

What is CVE-2021-24960?

The CVE-2021-24960 refers to a security flaw in the WordPress File Upload plugin that enables users with limited roles to exploit the upload form for uploading SVG files, which can then be misused in Cross-Site Scripting attacks.

The Impact of CVE-2021-24960

This vulnerability can be exploited by users with low roles such as Contributors to upload malicious SVG files, allowing attackers to execute arbitrary scripts on a victim's browser. It increases the risk of Cross-Site Scripting attacks on websites using the affected plugins.

Technical Details of CVE-2021-24960

The technical details of CVE-2021-24960 include:

Vulnerability Description

The vulnerability allows users with limited roles to upload SVG files that can lead to Cross-Site Scripting attacks, compromising the security of the website.

Affected Systems and Versions

Product: WordPress File Upload, wordpress-file-upload-pro
Versions Affected: < 4.16.3

Exploitation Mechanism

Attackers with low-level roles can manipulate the upload form to upload SVG files, enabling XSS attacks.

Mitigation and Prevention

To address CVE-2021-24960, consider the following steps:

Immediate Steps to Take

Update the WordPress File Upload and wordpress-file-upload-pro plugins to version 4.16.3 or later.
Restrict file upload permissions to trusted users only.

Long-Term Security Practices

Regularly monitor plugin updates and security advisories.
Educate users on safe file upload practices and potential risks of XSS vulnerabilities.

Patching and Updates

Ensure timely application of security patches and updates to the plugins to mitigate the risk of XSS attacks.