CVE-2021-40966 Explained : Impact and Mitigation

A Stored XSS vulnerability exists in TinyFileManager up to version 2.4.6. This vulnerability allows a malicious user to upload a file with a malicious filename containing JavaScript code, which can then execute within any user's browser.

Understanding CVE-2021-40966

This section provides insights into the specifics of the CVE-2021-40966 vulnerability.

What is CVE-2021-40966?

The CVE-2021-40966 vulnerability is a Stored XSS issue in TinyFileManager that arises when a server receives a file with HTML and JavaScript in its name. Upon upload, the malicious filename can execute JavaScript on any user's browser accessing the server.

The Impact of CVE-2021-40966

The vulnerability could lead to unauthorized execution of JavaScript code within users' browsers, potentially resulting in various malicious activities.

Technical Details of CVE-2021-40966

Exploring the technical aspects of CVE-2021-40966.

Vulnerability Description

Vulnerability Type: Stored XSS
Affected Version: All versions up to and including 2.4.6

Affected Systems and Versions

Product: TinyFileManager
Vendor: N/A
Versions: Up to and including 2.4.6

Exploitation Mechanism

The vulnerability occurs when a file with HTML and JavaScript in its name is uploaded to the server. The malicious filename can then execute JavaScript code in users' browsers.

Mitigation and Prevention

Understanding how to mitigate and prevent CVE-2021-40966.

Immediate Steps to Take

Update TinyFileManager to version 2.4.7 or a secure version that addresses the vulnerability.
Exercise caution when uploading files with potentially malicious filenames.

Long-Term Security Practices

Implement input validation to sanitize filenames and prevent script execution.
Regularly update and patch software to secure against known vulnerabilities.

Patching and Updates

Ensure timely patches and updates for TinyFileManager to address the CVE-2021-40966 vulnerability.