---
title: "TYPO3-EXT-SA-2019-019: Multiple vulnerabilities in extension \"MKSamlAuth\" (mksamlauth)"
url: "https://news.typo3.com/security/advisory/typo3-ext-sa-2019-019"
description: "It has been discovered that the extension \"MKSamlAuth\" (mksamlauth) is susceptible to Broken Authentication and Authentication Bypass."
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-2019-019: Multiple vulnerabilities in extension "MKSamlAuth" (mksamlauth)
- [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-2019-019: Multiple vulnerabilities in extension "MKSamlAuth" (mksamlauth)
======================================================================================
17 December 2019
It has been discovered that the extension "MKSamlAuth" (mksamlauth) is susceptible to Broken Authentication and Authentication Bypass.
- [Torben Hansen](https://news.typo3.com/article/author/torben-hansen)
- Release Date: December 17, 2019
- Component Type: Third party extension. This extension is not a part of the TYPO3 default installation.
- Vulnerability Type: Broken Authentication, Authentication Bypass
- Affected Versions: 9.5.2 - 9.5.0 and 8.7.1 - 8.7.0
- Severity: High
- Suggested CVSS v3.1: [AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N/E:F/RL:O/RC:C](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:L/A:N/E:F/RL:O/RC:C&version=3.1)
- CVE: Not assigned yet
### Problem Description
The extension fails to validate the response from the Identity Provider which allows an attacker to create various frontend users on affected TYPO3 websites.
The authentication service allows to bypass frontend user authentication by providing a valid username with an empty password, if a SAML configuration is not created for the current website domain.
### Solution
Updated versions 9.5.3 and 8.7.2 are available from the TYPO3 extension manager, Packagist and at
Users of the extension are advised to update the extension as soon as possible.
**Note:** It was not possible to fix the security issues without **breaking changes**. It is at least required to *reconfigure the SAML configuration record(s)* in the TYPO3 backend, because one configuration field has been added in order to mitigate the broken authentication issue.
Also note, that the new extension version in the TYPO3 Extension Repository does not bundle all required dependencies. The extension only works using TYPO3 in composer mode.
### Credits
Credits go to Helmut Hummel who discovered and reported the vulnerability.
### General Advice
Follow the recommendations that are given in the [TYPO3 Security Guide](https://docs.typo3.org/typo3cms/CoreApiReference/Security/Index.html#security-guidelines). Please subscribe to the [typo3-announce](http://lists.typo3.org/cgi-bin/mailman/listinfo/typo3-announce) mailing list.
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)