CVE-2020-13763 : Security Advisory and Response

In Joomla! before 3.9.19, the default settings of the global textfilter configuration do not block HTML inputs for Guest users.

Understanding CVE-2020-13763

This CVE identifies a security issue in Joomla! versions prior to 3.9.19 that allows HTML inputs for Guest users.

What is CVE-2020-13763?

This vulnerability in Joomla! allows Guest users to input HTML content due to inconsistent default textfilter settings.

The Impact of CVE-2020-13763

The vulnerability can lead to potential security risks such as cross-site scripting (XSS) attacks and unauthorized content manipulation.

Technical Details of CVE-2020-13763

Joomla! before version 3.9.19 is affected by this vulnerability.

Vulnerability Description

The default settings of the global textfilter configuration do not properly block HTML inputs for Guest users.

Affected Systems and Versions

Product: Joomla!
Versions affected: All versions before 3.9.19

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious HTML code through input fields accessible to Guest users.

Mitigation and Prevention

It is crucial to take immediate steps to address and prevent exploitation of this vulnerability.

Immediate Steps to Take

Update Joomla! to version 3.9.19 or later to mitigate the vulnerability.
Restrict access to input fields for Guest users to prevent unauthorized HTML inputs.

Long-Term Security Practices

Regularly update Joomla! and all its components to the latest versions.
Educate users on safe content input practices to prevent XSS attacks.

Patching and Updates

Ensure timely installation of security patches and updates provided by Joomla! to address known vulnerabilities.