CVE-2021-24961 Explained : Impact and Mitigation

This article provides detailed information about CVE-2021-24961, a vulnerability in the WordPress File Upload plugin that could lead to Cross-Site Scripting attacks.

Understanding CVE-2021-24961

CVE-2021-24961 is a security vulnerability found in the WordPress File Upload plugin versions prior to 4.16.3, allowing users with low roles like Contributor to execute Cross-Site Scripting attacks.

What is CVE-2021-24961?

The vulnerability exists in the shortcode argument handling of the WordPress File Upload plugin, making it susceptible to Cross-Site Scripting (XSS) attacks.

The Impact of CVE-2021-24961

Exploitation of this vulnerability could enable attackers to inject malicious scripts into web pages viewed by users, leading to unauthorized actions and potential data theft.

Technical Details of CVE-2021-24961

This section outlines the technical aspects of CVE-2021-24961, including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The WordPress File Upload plugin, versions prior to 4.16.3, does not properly escape some of its shortcode arguments, allowing contributors to execute XSS attacks.

Affected Systems and Versions

WordPress File Upload plugin < 4.16.3
wordpress-file-upload-pro plugin < 4.16.3

Exploitation Mechanism

By exploiting the insecure handling of shortcode arguments in the affected plugins, attackers with Contributor roles can inject malicious scripts into the website.

Mitigation and Prevention

To protect systems from CVE-2021-24961 and similar vulnerabilities, immediate and long-term security measures need to be implemented.

Immediate Steps to Take

Update the WordPress File Upload and wordpress-file-upload-pro plugins to version 4.16.3 or higher.
Restrict permissions for users with low roles to minimize the risk of XSS attacks.

Long-Term Security Practices

Regularly monitor and audit plugins for security vulnerabilities.
Educate users about the risks of XSS attacks and best security practices.

Patching and Updates

Stay updated with security patches and updates released by plugin developers. Implement patches promptly to address known vulnerabilities.