CVE-2019-9093 : Security Advisory and Response

Humhub 1.3.10 Community Edition has a Reflected Cross Site Scripting (XSS) Vulnerability in the file/file/upload function.

Understanding CVE-2019-9093

What is CVE-2019-9093?

A Reflected Cross Site Scripting (XSS) Vulnerability was identified in Humhub 1.3.10 Community Edition, allowing malicious JavaScript payloads in the filename parameter to be echoed back, leading to reflected XSS.

The Impact of CVE-2019-9093

This vulnerability could be exploited by attackers to execute malicious scripts in the context of a user's browser, potentially leading to unauthorized actions or data theft.

Technical Details of CVE-2019-9093

Vulnerability Description

The vulnerability exists in the file/file/upload function of Humhub 1.3.10 Community Edition, where user-supplied input with JavaScript payloads in the filename parameter is not properly sanitized.

Affected Systems and Versions

Product: Humhub 1.3.10 Community Edition
Vendor: Not specified
Versions: Not specified

Exploitation Mechanism

Attackers can craft URLs containing malicious JavaScript payloads in the filename parameter.
When a user clicks on the crafted URL, the payload gets executed in the user's browser, leading to XSS.

Mitigation and Prevention

Immediate Steps to Take

Apply security patches or updates provided by Humhub to address this vulnerability.
Educate users about the risks of clicking on untrusted links or URLs.

Long-Term Security Practices

Implement input validation and output encoding to prevent XSS vulnerabilities.
Regularly monitor and audit web applications for security flaws.

Patching and Updates

Stay informed about security advisories and updates from Humhub.