We in the TYPO3 Core Team and Security Team were happy that the release had finally solved this long-standing, severe issue with a bullet-proof solution. But maybe it was too bullet-proof? We were soon contacted by people from around the TYPO3 community who told us about situations where the sanitizer cleaned up too much or in the wrong places.

In this article we look at what the security release is fixing, what is causing the issues, and how to solve them.