CVE-2021-24782 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2021-24782, a vulnerability found in the Flex Local Fonts WordPress plugin version 1.0.0.

Understanding CVE-2021-24782

CVE-2021-24782, titled 'Flex Local Fonts <= 1.0.0 - Admin+ Stored Cross-Site-Scripting,' affects users of the Flex Local Fonts plugin through version 1.0.0. The vulnerability lies in the plugin's handling of the Class Name field.

What is CVE-2021-24782?

The Flex Local Fonts WordPress plugin version 1.0.0 fails to properly escape the Class Name field when adding a font. This oversight enables high-privilege users to execute Cross-Site Scripting attacks, even if the unfiltered_html capability is restricted.

The Impact of CVE-2021-24782

This vulnerability could allow malicious users to inject scripts into web pages viewed by other users. By exploiting this issue, attackers could steal sensitive information, perform actions on behalf of users, or deface websites.

Technical Details of CVE-2021-24782

The technical details of CVE-2021-24782 are as follows:

Vulnerability Description

The vulnerability in Flex Local Fonts plugin through version 1.0.0 allows users with certain privileges to perform Cross-Site Scripting attacks by manipulating the Class Name field.

Affected Systems and Versions

The affected system is the Flex Local Fonts WordPress plugin with version 1.0.0.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts into the Class Name field, which are then executed when the font is used, leading to potential XSS attacks.

Mitigation and Prevention

To mitigate the risks associated with CVE-2021-24782, consider the following steps:

Immediate Steps to Take

Update the Flex Local Fonts plugin to a version that addresses this vulnerability.
Restrict access to high-privilege accounts to minimize the impact of potential XSS attacks.

Long-Term Security Practices

Regularly monitor for plugin updates and apply them promptly to patch known security issues.
Educate users about safe practices when adding content or using features that involve user input.

Patching and Updates

Visit the official WPScan website for detailed information on the CVE-2021-24782 vulnerability and instructions on how to update or patch the affected plugin.