CVE-2021-24513 : Security Advisory and Response

A detailed overview of CVE-2021-24513, a vulnerability in the Form Builder WordPress plugin.

Understanding CVE-2021-24513

This section will cover what CVE-2021-24513 is, its impact, technical details, and mitigation steps.

What is CVE-2021-24513?

The Form Builder WordPress plugin before version 1.9.8.4 is vulnerable to authenticated stored Cross-Site Scripting (XSS) attacks. This flaw allows high privilege users to inject malicious scripts into the Form Title.

The Impact of CVE-2021-24513

The vulnerability in the Form Builder plugin can be exploited by admin users to execute XSS attacks, potentially compromising the security and integrity of the affected WordPress sites.

Technical Details of CVE-2021-24513

In this section, we will delve into the specifics of the vulnerability.

Vulnerability Description

The issue lies in the plugin's failure to sanitize or escape the Form Title, enabling attackers to inject malicious payloads even when unfiltered_html capability is restricted.

Affected Systems and Versions

Form Builder plugin versions prior to 1.9.8.4 are impacted by this vulnerability, leaving websites using these versions susceptible to XSS attacks.

Exploitation Mechanism

The vulnerability can be exploited by authenticated adversaries with admin privileges who can insert harmful scripts into the Form Title field.

Mitigation and Prevention

This section provides guidance on how to address and prevent CVE-2021-24513.

Immediate Steps to Take

Site administrators are advised to update the Form Builder plugin to version 1.9.8.4 or newer to mitigate the XSS risk.

Long-Term Security Practices

Implement strict input validation and output sanitization practices to mitigate the risk of XSS vulnerabilities in WordPress plugins.

Patching and Updates

Regularly check for plugin updates and apply patches promptly to safeguard against known security vulnerabilities.