---
title: "TYPO3-EXT-SA-2018-008: Cross-Site Scripting in extension \"Frontend Treeview\" (mh_treeview)"
url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2018-008"
description: "It has been discovered that the extension \"Frontend Treeview\" (mh_treeview) is susceptible to Cross-Site Scripting."
image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg"
date: 2026-06-11
modified: 2026-06-11
categories:
  - "Developer & Technology"
  - TYPO3 Extensions
---

# TYPO3-EXT-SA-2018-008: Cross-Site Scripting in extension "Frontend Treeview" (mh_treeview)

- [Developer & Technology](https://news.typo3.com/article/category/developer-technology)
- Security / [TYPO3 Extensions](https://news.typo3.com/article/category/security/typo3-extensions)

TYPO3-EXT-SA-2018-008: Cross-Site Scripting in extension "Frontend Treeview" (mh\_treeview)
===========================================================================================

09 August 2018

![A laptop screen displaying a list of security advisories](https://news.typo3.com/typo3temp/assets/_processed_/d/c/csm_security_blog_default_77f8e86036.webp)

It has been discovered that the extension "Frontend Treeview" (mh\_treeview) is susceptible to Cross-Site Scripting.

- ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/e4eaa13e33dd086a9c06f2570cb34609.jpeg)[Torben Hansen](https://news.typo3.com/article/author/torben-hansen)

- Release Date: August 9, 2018
- Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
- Vulnerability Type: Cross-Site Scripting
- Affected Versions: 0.1.0 and below
- Severity: High
- Suggested CVSS v3.0: [AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:F/RL:U/RC:C](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N/E:F/RL:U/RC:C)
- CVE: not assigned yet

### Problem Description

The extension fails to properly encode user input for output in HTML context.

### Solution

Versions of this extension that are known to be vulnerable will no longer be available for download from the TYPO3 Extension Repository. The extension author failed in providing a security fix for the reported vulnerability in a decent amount of time.

Please uninstall and delete the extension folder from your installation.

### Credits

Thanks to Security Team Member Nicole Cordes who discovered and reported the vulnerability.

### General Advice

Follow the recommendations that are given in the [TYPO3 Security Guide](https://docs.typo3.org/typo3cms/SecurityGuide/). Please subscribe to the [typo3-announce](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce) mailing list.

![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/7cf52722a5b7183b29d378a2284bd103.jpeg)

About the Author

[Torben Hansen](https://news.typo3.com/article/author/torben-hansen)

Open Source Enthusiast & TYPO3 Expert

I’m a passionate open-source advocate and dedicated TYPO3 expert. As a freelancer, I offer professional TYPO3 services to clients while actively contributing to the TYPO3 ecosystem. I have developed several public TYPO3 extensions and serve as the Co-Lead of the TYPO3 Security Team, helping to enhance the platform’s security and functionality. For many years, I have been blogging about TYPO3, sharing insights and expertise with the community.

[More posts by this author](https://news.typo3.com/article/author/torben-hansen)