CVE-2021-24927 : Vulnerability Insights and Analysis

This article provides an in-depth analysis of CVE-2021-24927, a vulnerability found in the My Calendar WordPress plugin before version 3.2.18, leading to Reflected Cross-Site Scripting.

Understanding CVE-2021-24927

This section delves into the details of the vulnerability and its potential impact on affected systems.

What is CVE-2021-24927?

The My Calendar WordPress plugin before version 3.2.18 fails to sanitize and escape the callback parameter of the mc_post_lookup AJAX action, enabling a reflected Cross-Site Scripting issue.

The Impact of CVE-2021-24927

The vulnerability allows any authenticated user to execute malicious scripts in the context of the victim's browser, potentially leading to various attacks like account takeovers or stealing sensitive information.

Technical Details of CVE-2021-24927

This section provides a technical overview of the vulnerability, including how the exploit works and the systems affected.

Vulnerability Description

The My Calendar plugin's failure to properly sanitize user-provided input allows for the injection of malicious scripts, opening the door to Cross-Site Scripting attacks.

Affected Systems and Versions

My Calendar versions earlier than 3.2.18 are vulnerable to this exploit, exposing websites to potential security risks.

Exploitation Mechanism

By manipulating the callback parameter of the mc_post_lookup AJAX action, attackers can craft URLs that, when accessed by authenticated users, execute arbitrary scripts in their browsers.

Mitigation and Prevention

This section outlines measures to mitigate the CVE-2021-24927 vulnerability and prevent potential exploitation.

Immediate Steps to Take

Website administrators are advised to update the My Calendar plugin to version 3.2.18 or later to patch the vulnerability and protect against Cross-Site Scripting attacks.

Long-Term Security Practices

In addition to updating the plugin, implementing secure coding practices, conducting regular security audits, and educating users about safe browsing habits can help enhance overall website security.

Patching and Updates

Regularly monitoring security advisories and promptly applying patches released by plugin developers is crucial to safeguarding websites against known vulnerabilities.