TYPO3-CORE-SA-2019-004: Cross-Site Scripting in Language Pack Handling

Categories: Development
It has been discovered, that TYPO3 CMS is vulnerable to cross-site scripting.
  • Component Type: TYPO3 CMS
  • Vulnerable subcomponent: Language Pack Handling (ext:install)
  • Release Date: January 22, 2019
  • Vulnerability Type: Cross-Site Scripting
  • Affected Versions: 9.2.0-9.5.3
  • Severity: Medium
  • Suggested CVSS v3.0: AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:F/RL:O/RC:C
  • CVE: not assigned yet

Problem Description

Failing to properly encode information from external sources, language pack handling in the install tool is vulnerable to cross-site scripting.


Update to TYPO3 version 9.5.4 that fixes the problem described.


Thanks to TYPO3 core team member Georg Ringer who reported this issue and to TYPO3 core team member 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

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