TYPO3-CORE-SA-2020-001: Information Disclosure in Password Reset

Categories: Development Created by Oliver Hader
It has been discovered that TYPO3 CMS is susceptible to information disclosure.

Problem Description

It has been discovered that time-based attacks can be used with the password reset functionality for backend users. This allows an attacker to verify whether a backend user account with a given email address exists or not.


Update to TYPO3 version 10.4.2 that fixes the problem described.


Thanks to Michael Kasten who reported this issue and to TYPO3 merger Frank Nägler who fixed the issue.

General Advice

Follow the recommendations that are given in the TYPO3 Security Guide. Please subscribe to the 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.