CVE-2021-26030 : What You Need to Know

An issue was discovered in Joomla! 3.0.0 through 3.9.25 that allowed XSS attacks using the logo parameter of the default templates on error pages.

Understanding CVE-2021-26030

This CVE relates to a cross-site scripting (XSS) vulnerability in Joomla! CMS versions 3.0.0 through 3.9.25.

What is CVE-2021-26030?

CVE-2021-26030 is a security vulnerability in Joomla! CMS that enables XSS attacks via the logo parameter in the default templates displayed on error pages.

The Impact of CVE-2021-26030

Exploitation of this vulnerability could allow malicious actors to inject and execute malicious scripts in the context of a victim's web session, potentially leading to account takeover, data theft, or other unauthorized activities.

Technical Details of CVE-2021-26030

The following technical details provide insight into the CVE-2021-26030 vulnerability:

Vulnerability Description

The vulnerability arises due to inadequate escaping in Joomla! 3.0.0 through 3.9.25, enabling attackers to launch XSS attacks using the logo parameter in the default templates shown on error pages.

Affected Systems and Versions

Joomla! CMS versions 3.0.0 through 3.9.25 are affected by this security flaw.

Exploitation Mechanism

Attackers can exploit this vulnerability by injecting malicious scripts through the logo parameter of the default templates on error pages, potentially compromising the security and integrity of the affected systems.

Mitigation and Prevention

To address CVE-2021-26030 and enhance system security, the following mitigation strategies are recommended:

Immediate Steps to Take

Update Joomla! CMS to a non-vulnerable version (post 3.9.25).
Apply security patches provided by Joomla! Project to fix the XSS vulnerability.

Long-Term Security Practices

Regularly update Joomla! CMS to the latest secure version to prevent known vulnerabilities.
Employ web application firewalls (WAF) to filter and block malicious traffic targeting XSS vulnerabilities.
Educate users and administrators about safe coding practices and the risks associated with XSS attacks.

Patching and Updates

Stay informed about security advisories from Joomla! Project and promptly apply recommended patches and updates to secure your Joomla! CMS installation.