CVE-2020-5810 : What You Need to Know

A stored XSS vulnerability exists in Umbraco CMS <= 8.9.1 or current version, allowing an authenticated user to upload a malicious .svg file as a stored XSS payload.

Understanding CVE-2020-5810

This CVE involves a Stored Cross-Site Scripting (XSS) vulnerability in Umbraco CMS.

What is CVE-2020-5810?

Umbraco CMS <= 8.9.1 or current version is susceptible to a stored XSS vulnerability, enabling an authenticated user to upload a malicious .svg file to execute XSS attacks.

The Impact of CVE-2020-5810

The vulnerability allows attackers to inject malicious scripts into the website, potentially leading to unauthorized access, data theft, and other security breaches.

Technical Details of CVE-2020-5810

This section provides detailed technical information about the vulnerability.

Vulnerability Description

A stored XSS vulnerability in Umbraco CMS <= 8.9.1 or current version allows an authenticated user to upload a malicious .svg file, acting as a stored XSS payload.

Affected Systems and Versions

Product: Umbraco CMS
Vendor: n/a
Versions Affected: <= 8.9.1 or current (unfixed)

Exploitation Mechanism

The vulnerability is exploited by an authenticated user authorized to upload media, who can upload a crafted .svg file to execute the stored XSS payload.

Mitigation and Prevention

Protect your systems from CVE-2020-5810 with the following steps:

Immediate Steps to Take

Update Umbraco CMS to a patched version.
Restrict media upload permissions to trusted users.
Implement content security policies to mitigate XSS risks.

Long-Term Security Practices

Regularly monitor and audit user-uploaded content.
Educate users on safe uploading practices to prevent malicious file uploads.

Patching and Updates

Stay informed about security updates for Umbraco CMS.
Apply patches promptly to address known vulnerabilities.