CVE-2021-43841 Explained : Impact and Mitigation

XWiki platform is vulnerable to a Cross-Site Scripting (XSS) attack via SVG upload. Users are advised to take immediate action to prevent exploitation.

Understanding CVE-2021-43841

XWiki platform allows attackers to execute scripts through SVG file uploads, posing a security risk.

What is CVE-2021-43841?

XWiki platform, versions < 12.10.6 and >= 13.0, < 13.3RC1, permits attackers to upload SVG files containing malicious scripts, leading to XSS vulnerabilities.

The Impact of CVE-2021-43841

The vulnerability has a CVSS base score of 5.4 (Medium severity) and low impacts on confidentiality, integrity, and availability.

Technical Details of CVE-2021-43841

XWiki platform's vulnerability details and affected systems.

Vulnerability Description

By default, XWiki allows SVG file upload with potentially harmful scripts, enabling XSS attacks upon download.

Affected Systems and Versions

Versions < 12.10.6 and >= 13.0, < 13.3RC1 of xwiki-platform

Exploitation Mechanism

Attackers upload malicious scripts within SVG files, triggering XSS upon file download.

Mitigation and Prevention

Protect your system from CVE-2021-43841 to enhance security.

Immediate Steps to Take

Update XWiki to versions that patch the SVG upload vulnerability.
Disallow the upload of SVG files to prevent exploitation.

Long-Term Security Practices

Regularly monitor and update security configurations.
Train users to identify and report suspicious file uploads.

Patching and Updates

Install patches provided by XWiki to secure the platform against SVG-based XSS attacks.