CVE-2021-24925 : What You Need to Know

The Modern Events Calendar Lite WordPress plugin before version 6.1.5 is affected by a Reflected Cross-Site Scripting vulnerability due to inadequate sanitization of the current_month_divider parameter in its mec_list_load_more AJAX call. This vulnerability allows both authenticated and unauthenticated users to execute malicious scripts.

Understanding CVE-2021-24925

This CVE involves a security issue in the Modern Events Calendar Lite plugin for WordPress, where version 6.1.5 and below are susceptible to Reflected Cross-Site Scripting attacks.

What is CVE-2021-24925?

The CVE-2021-24925 vulnerability in the Modern Events Calendar Lite plugin allows attackers to inject malicious scripts via the current_month_divider parameter in the mec_list_load_more AJAX call, potentially leading to unauthorized access or data theft.

The Impact of CVE-2021-24925

Exploitation of this vulnerability can result in unauthorized script execution, potentially leading to the theft of sensitive information, unauthorized access to user data, or manipulation of website content.

Technical Details of CVE-2021-24925

This section provides in-depth technical information about the vulnerability.

Vulnerability Description

The issue lies in the plugin's failure to properly sanitize user-supplied input, allowing attackers to inject and execute malicious scripts in the context of the victim's browser.

Affected Systems and Versions

Modern Events Calendar Lite versions prior to 6.1.5 are impacted by this vulnerability.

Exploitation Mechanism

Attackers can exploit this flaw by crafting a malicious link containing the payload and tricking a user into clicking on it, thereby executing the injected script in the victim's browser.

Mitigation and Prevention

To protect your systems from CVE-2021-24925, follow the recommended mitigation strategies below.

Immediate Steps to Take

Update to version 6.1.5 or later of the Modern Events Calendar Lite plugin to mitigate the vulnerability.
Regularly monitor official security advisories and patches from the plugin vendor.

Long-Term Security Practices

Implement input validation routines to sanitize user inputs effectively.
Educate users on identifying and avoiding malicious links or content.

Patching and Updates

Stay informed about security updates and patches released by the plugin vendor. Apply updates promptly to ensure your system is protected against known vulnerabilities.