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TYPO3-CORE-SA-2019-005: Cross-Site Scripting in Fluid ViewHelpers

Categories: Development
It has been discovered, that TYPO3 CMS is vulnerable to cross-site scripting.
  • Component Type: TYPO3 CMS
  • Vulnerable subcomponent: Fluid (ext:fluid)
  • Release Date: January 22, 2019
  • Vulnerability Type: Cross-Site Scripting
  • Affected Versions: 8.0.0-8.7.22 and 9.0.0-9.5.3
  • 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 user input, templates using built-in Fluid ViewHelpers are vulnerable to cross-site scripting.

Solution

Update to TYPO3 versions 8.7.23 or 9.5.4 that fix the problem described.

Credits

Thanks to Markus Gerdes who reported this issue and to TYPO3 core team member Andreas Wolf 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.