CVE-2023-36675 : What You Need to Know

An issue was discovered in MediaWiki before 1.35.11, 1.36.x through 1.38.x before 1.38.7, and 1.39.x before 1.39.4. BlockLogFormatter.php in BlockLogFormatter allows XSS in the partial blocks feature.

Understanding CVE-2023-36675

This CVE describes a cross-site scripting (XSS) vulnerability found in MediaWiki versions before 1.35.11, 1.36.x through 1.38.7, and 1.39.x before 1.39.4.

What is CVE-2023-36675?

CVE-2023-36675 is a security flaw in MediaWiki that enables XSS attacks through the BlockLogFormatter component, specifically impacting the partial blocks feature.

The Impact of CVE-2023-36675

This vulnerability could allow an attacker to execute malicious scripts in the context of a user's session on an affected MediaWiki instance, leading to potential data theft or unauthorized actions.

Technical Details of CVE-2023-36675

The following technical details outline the vulnerability further:

Vulnerability Description

The issue exists in the BlockLogFormatter.php file, allowing unauthorized script execution within the partial blocks functionality of MediaWiki versions mentioned.

Affected Systems and Versions

MediaWiki versions before 1.35.11, 1.36.x through 1.38.7, and 1.39.x before 1.39.4 are affected by this XSS vulnerability.

Exploitation Mechanism

Attackers can exploit this flaw by injecting malicious scripts into the partial blocks feature, potentially compromising user sessions and sensitive data.

Mitigation and Prevention

To address CVE-2023-36675, consider the following mitigation strategies:

Immediate Steps to Take

Update MediaWiki to versions 1.35.11, 1.38.7, or 1.39.4, which contain patches for this vulnerability.
Monitor for any abnormal activities or unauthorized access on the affected systems.

Long-Term Security Practices

Regularly update and patch software to the latest versions to prevent known vulnerabilities.
Educate users about best practices to avoid falling victim to XSS attacks.

Patching and Updates

Refer to the official release notes and advisories provided by MediaWiki and relevant vendors to apply the necessary security updates.