CVE-2021-24670 : What You Need to Know

The CoolClock WordPress plugin before version 4.3.5 is vulnerable to Stored Cross-Site Scripting attacks, allowing users with low roles like contributors to exploit the plugin.

Understanding CVE-2021-24670

This CVE refers to a security vulnerability in the CoolClock WordPress plugin that enables contributors and higher roles to execute Stored Cross-Site Scripting attacks.

What is CVE-2021-24670?

The vulnerability in the CoolClock plugin version before 4.3.5 allows users with roles as low as Contributor to conduct Stored Cross-Site Scripting attacks by not properly escaping certain shortcode attributes.

The Impact of CVE-2021-24670

This vulnerability could lead to malicious contributors injecting and executing arbitrary script code on the websites using the affected CoolClock plugin, potentially compromising user data and the website's security.

Technical Details of CVE-2021-24670

The technical details of CVE-2021-24670 include:

Vulnerability Description

The vulnerability lies in the CoolClock WordPress plugin version prior to 4.3.5, where certain shortcode attributes are not properly sanitized, enabling contributors to perform Stored Cross-Site Scripting attacks.

Affected Systems and Versions

The affected system includes websites using the CoolClock WordPress plugin version earlier than 4.3.5.

Exploitation Mechanism

Attackers with Contributor or higher roles can exploit the vulnerability by injecting malicious scripts via specific shortcode attributes in the CoolClock plugin.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-24670, consider the following steps:

Immediate Steps to Take

Update the CoolClock WordPress plugin to version 4.3.5 or later.
Restrict plugin installation permissions to trusted users only.

Long-Term Security Practices

Regularly monitor and audit user roles and permissions on your WordPress site.
Educate website administrators and users about the risks of Cross-Site Scripting attacks.

Patching and Updates

Stay informed about security updates released by the CoolClock plugin developer and apply patches promptly to ensure your website's security.