CVE-2021-24705 : What You Need to Know

NEX-Forms < 8.4.3 - Stored Cross-Site Scripting via CSRF

Understanding CVE-2021-24705

This CVE involves a stored cross-site scripting (XSS) vulnerability in the NEX-Forms WordPress plugin version prior to 8.4.3, allowing attackers to inject malicious scripts via CSRF.

What is CVE-2021-24705?

The NEX-Forms WordPress plugin before version 8.4.3 is vulnerable to stored XSS due to missing CSRF checks when editing a form. This flaw enables attackers to manipulate forms with XSS payloads, potentially compromising security.

The Impact of CVE-2021-24705

Exploitation of this vulnerability could lead to Cross-Site Scripting attacks, where malicious scripts are executed in the context of a user's session, posing a serious security risk to WordPress websites utilizing the NEX-Forms plugin.

Technical Details of CVE-2021-24705

The technical details of this CVE include:

Vulnerability Description

The issue arises from the lack of CSRF validation during form editing, allowing threat actors to insert XSS payloads that may execute when the form is viewed or submitted.

Affected Systems and Versions

The affected system is the NEX-Forms WordPress plugin with versions prior to 8.4.3. Websites running these vulnerable versions are at risk of exploitation.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting malicious forms with XSS payloads and tricking an authenticated admin user into editing them, leading to script execution in the admin's session.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-24705, consider the following steps:

Immediate Steps to Take

Update the NEX-Forms plugin to version 8.4.3 or newer to patch the XSS vulnerability and implement CSRF checks.
Monitor website activity for any signs of unauthorized form editing or suspicious behavior.

Long-Term Security Practices

Regularly audit and review plugins for security vulnerabilities, ensuring they are up to date and maintained.
Educate users on secure form editing practices to prevent malicious injections and XSS attacks.

Patching and Updates

Stay informed about security updates and patches released by the plugin developer. Promptly apply patches to secure your WordPress website against known vulnerabilities.