CVE-2021-24934 : Exploit Details and Defense Strategies

The Visual CSS Style Editor WordPress plugin before version 7.5.4 is affected by a Reflected Cross-Site Scripting vulnerability due to improper sanitization of the wyp_page_type parameter.

Understanding CVE-2021-24934

This CVE refers to a security issue in the Visual CSS Style Editor plugin for WordPress, allowing malicious actors to execute cross-site scripting attacks.

What is CVE-2021-24934?

The Visual CSS Style Editor plugin, prior to version 7.5.4, fails to properly sanitize and escape the wyp_page_type parameter, enabling attackers to inject and execute malicious scripts on vulnerable websites.

The Impact of CVE-2021-24934

Exploiting this vulnerability could lead to unauthorized access, data theft, and potential compromise of website integrity, impacting both site owners and visitors.

Technical Details of CVE-2021-24934

The following technical aspects describe the CVE-2021-24934 vulnerability.

Vulnerability Description

The vulnerability arises from the plugin's failure to properly sanitize the wyp_page_type parameter, allowing attackers to inject and execute malicious scripts on affected WordPress sites.

Affected Systems and Versions

Visual CSS Style Editor versions earlier than 7.5.4 are vulnerable to this exploit, exposing websites to potential cross-site scripting attacks.

Exploitation Mechanism

Attackers can exploit this vulnerability by crafting specially-crafted URLs containing malicious scripts that, when executed, can manipulate site content and compromise user data.

Mitigation and Prevention

To safeguard WordPress websites from CVE-2021-24934, adopt the following mitigation strategies.

Immediate Steps to Take

Update the Visual CSS Style Editor plugin to version 7.5.4 or later to patch the vulnerability and prevent exploitation.
Regularly monitor website activity for suspicious behavior or unauthorized access attempts.

Long-Term Security Practices

Implement web application firewalls (WAF) and security plugins to enhance website defenses against XSS attacks.
Educate website administrators on secure coding practices and the risks associated with unvalidated user input.

Patching and Updates

Stay informed about security updates and patches for WordPress plugins, ensuring timely application to mitigate known vulnerabilities.