CVE-2021-24870 : What You Need to Know

A critical vulnerability exists in the WP Fastest Cache WordPress plugin before version 0.9.5, allowing attackers to perform a Cross-Site Scripting (XSS) attack.

Understanding CVE-2021-24870

This CVE highlights a weakness in the WP Fastest Cache plugin that could lead to stored Cross-Site Scripting (XSS) due to a lack of proper input validation.

What is CVE-2021-24870?

The CVE-2021-24870 vulnerability in WP Fastest Cache plugin version 0.9.5 and below allows high privilege users to inject malicious scripts via the wpfc_save_cdn_integration AJAX action, posing a serious security risk.

The Impact of CVE-2021-24870

Exploitation of this vulnerability can result in unauthorized access, data theft, defacement, and other malicious activities on affected websites. It may compromise user data and trust.

Technical Details of CVE-2021-24870

This section delves into the specifics of the vulnerability, including affected systems, exploitation methods, and potential risks.

Vulnerability Description

The vulnerability arises from the lack of CSRF checks in the wpfc_save_cdn_integration AJAX action, enabling attackers to execute a Cross-Site Scripting (XSS) payload.

Affected Systems and Versions

WP Fastest Cache versions prior to 0.9.5 are susceptible to this CSRF to Stored Cross-Site Scripting attack, putting all websites using these versions at risk.

Exploitation Mechanism

By exploiting the lack of input sanitization and escaping in certain plugin options, attackers can trick authenticated high privilege users into executing malicious scripts, leading to XSS attacks.

Mitigation and Prevention

To protect your website from CVE-2021-24870, immediate actions along with long-term security practices are essential.

Immediate Steps to Take

Update WP Fastest Cache plugin to version 0.9.5 or newer to patch the vulnerability. Monitor website activity for any signs of unauthorized access or malicious scripts.

Long-Term Security Practices

Regularly update plugins and themes, perform security audits, implement web application firewalls, and educate users about phishing and social engineering risks.

Patching and Updates

Stay informed about security patches and updates released by WP Fastest Cache developers. Promptly apply these patches to ensure your website's security.