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TYPO3-CORE-SA-2019-007: Cross-Site Scripting in Form Framework

Categories: Development
It has been discovered, that TYPO3 CMS is vulnerable to cross-site scripting.
  • Component Type: TYPO3 CMS
  • Vulnerable subcomponent: Form Framework (ext:form)
  • Release Date: January 22, 2019
  • Vulnerability Type: Cross-Site Scripting
  • Affected Versions: 8.5.0-8.7.22 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, frontend forms handled by the form framework (system extension “form”) are vulnerable to cross-site scripting.

Solution

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

Strong security defaults - Manual actions required

Since using markup on purpose in form definitions is not possible anymore, this behavior has to be adjusted to make use of a proper Fluid template for the according ConfirmationFinisher - see https://docs.typo3.org/typo3cms/extensions/core/latest/Changelog/8.7.x/Feature-83405-AddConfirmationFinisherTemplate.html for details.

Credits

Thanks to TYPO3 core team member Susanne Moog who reported this issue and to TYPO3 core team member Ralf Zimmermann 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.