TYPO3-CORE-SA-2019-021: Cross-Site Scripting in Form Framework validation handling

Problem Description

It has been discovered that the output of field validation errors in the Form Framework is vulnerable to cross-site scripting.

Solution

Update to TYPO3 versions 8.7.30 or 9.5.12 or 10.2.2 that fix the problem described.

Credits

Thanks to Aslam Idrisov and an anonymous contributor who reported this issue and to TYPO3 framework 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.

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