CVE-2021-24977 : Vulnerability Insights and Analysis

The WordPress plugin 'Use Any Font | Custom Font Uploader' before version 6.2.1 is affected by a critical vulnerability that allows unauthenticated users to append arbitrary CSS, potentially leading to Stored Cross-Site Scripting (XSS) attacks.

Understanding CVE-2021-24977

This CVE describes a security issue in the 'Use Any Font | Custom Font Uploader' WordPress plugin that could be exploited by malicious actors.

What is CVE-2021-24977?

The Use Any Font | Custom Font Uploader WordPress plugin before 6.2.1 lacks authorization checks, enabling unauthorized users to inject CSS code. This code can then be executed on the frontend, affecting all users. The absence of proper sanitization and escaping mechanisms in the backend further exacerbates the risk, potentially leading to Stored XSS vulnerabilities.

The Impact of CVE-2021-24977

Exploitation of this vulnerability could allow attackers to execute arbitrary code, manipulate content, steal sensitive information, or perform other malicious actions on affected websites.

Technical Details of CVE-2021-24977

This section covers specific technical details about the vulnerability.

Vulnerability Description

The vulnerability arises from the lack of authorization checks when assigning fonts, enabling unauthenticated users to inject malicious CSS code.

Affected Systems and Versions

The vulnerability affects versions of the 'Use Any Font | Custom Font Uploader' plugin prior to version 6.2.1.

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted CSS payloads to the affected plugin, which are then processed on the frontend, potentially leading to Stored XSS attacks.

Mitigation and Prevention

To safeguard your systems against the CVE-2021-24977 vulnerability, certain steps can be taken.

Immediate Steps to Take

Immediately update the 'Use Any Font | Custom Font Uploader' plugin to version 6.2.1 or higher to mitigate the vulnerability.
Consider implementing additional access controls and security measures to restrict unauthorized access to the plugin.

Long-Term Security Practices

Regularly monitor for security updates and patches released by plugin developers and apply them promptly.
Conduct security assessments and audits of your WordPress plugins to identify and remediate potential vulnerabilities.

Patching and Updates

Stay informed about security best practices and follow industry-standard guidelines to enhance the overall security posture of your WordPress websites.