---
title: "TYPO3-CORE-SA-2019-010: Information Disclosure in User Authentication"
url: "https://news.typo3.com/security/advisory/typo3-core-sa-2019-010"
description: It has been discovered, that TYPO3 CMS is susceptible to information disclosure.
image: "https://news.typo3.com/_assets/d1e01514e4c4a5b3147940fa2ec50682/Images/og-image-news.jpg"
date: 2026-06-11
modified: 2026-06-11
categories:
  - "Developer & Technology"
  - TYPO3 CMS
---

# TYPO3-CORE-SA-2019-010: Information Disclosure in User Authentication

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

TYPO3-CORE-SA-2019-010: Information Disclosure in User Authentication
=====================================================================

07 May 2019

![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 TYPO3 CMS is susceptible to information disclosure.

- ![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/b8266fdc667b773926c59081862ab148.jpeg)[Oliver Hader](https://news.typo3.com/article/author/oliver-hader)

- **Component Type:** TYPO3 CMS
- **Vulnerable subcomponent:** User Authentication (ext:core)
- **Release Date:** May 7, 2019
- **Vulnerability Type:** Information Disclosure
- **Affected Versions:** 9.0.0-9.5.5
- **Severity:** Medium
- **Suggested CVSS v3.0:** [AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N](https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:N/A:N)
- **CVE:** not assigned yet

### Problem Description

It has been discovered that login failures have been logged on the default stream with log level "warning" including plain-text user credentials.

### Solution

Update to TYPO3 version 9.5.6 that fixes the problem described. The according log level has been changed to "debug" which needs to be enabled explicitly.

### Credits

Thanks to [Helmut Hummel](https://github.com/helhum/) who reported and fixed this issue.

### General Advice

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

### General Note

All security related code changes are tagged so that you can easily look them up in our [review system](https://review.typo3.org/#/q/status:merged+project:Packages/TYPO3.CMS+topic:security,n,z).

![](https://news.typo3.com/typo3temp/assets/t3g/blog/gravatar/cc7cba9757f98fbe05023a139119df74.jpeg)

About the Author

[Oliver Hader](https://news.typo3.com/article/author/oliver-hader)

Core Developer at TYPO3 GmbH,Hof, Germany

[Website](https://typo3.com)[Twitter](https://twitter.com/ohader)[LinkedIn](https://www.linkedin.com/in/oliverhader/)[Xing](https://www.xing.com/profile/Oliver_Hader)

Oliver started to work with TYPO3 in 2005 and was fascinated by the product and its universe. Since 2007 he is member of the TYPO3 Core Team. After going back to university in 2014 for achieving a postgraduate master degree in internet web science, he is now researching on advanced web technology topics in general and for TYPO3 in particular.

In his spare time, Oliver loves to go cycling cross-country in the uplands around Hof (Germany) in northern Bavaria - at the region where he's living as well.

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