CVE-2020-11891 Explained : Impact and Mitigation

An issue was discovered in Joomla! before 3.9.17. Incorrect ACL checks in the access level section of com_users allow the unauthorized editing of usergroups.

Understanding CVE-2020-11891

This CVE identifies a vulnerability in Joomla! that could lead to unauthorized editing of usergroups due to incorrect ACL checks.

What is CVE-2020-11891?

The vulnerability in Joomla! before version 3.9.17 allows unauthorized users to edit usergroups by exploiting incorrect ACL checks in the access level section of com_users.

The Impact of CVE-2020-11891

The vulnerability could result in unauthorized users gaining access to edit usergroups, potentially leading to unauthorized changes and compromises in the Joomla! system.

Technical Details of CVE-2020-11891

This section provides more technical insights into the CVE.

Vulnerability Description

The issue stems from incorrect ACL checks in the access level section of com_users in Joomla!, enabling unauthorized editing of usergroups.

Affected Systems and Versions

Product: Joomla!
Versions affected: Before 3.9.17

Exploitation Mechanism

Unauthorized users can exploit the vulnerability by manipulating ACL checks in the access level section of com_users to gain unauthorized access to edit usergroups.

Mitigation and Prevention

Protect your system from this vulnerability with the following steps:

Immediate Steps to Take

Update Joomla! to version 3.9.17 or later to mitigate the vulnerability.
Regularly review and adjust ACL settings to ensure proper access control.

Long-Term Security Practices

Conduct regular security audits to identify and address vulnerabilities.
Educate users on best practices for access control and usergroup management.

Patching and Updates

Stay informed about security updates and patches released by Joomla! to address vulnerabilities like CVE-2020-11891.