TYPO3 11.5.21

Release Notes

Version 11.5.21

Release Notes for TYPO3 CMS 11.5.21

This document contains information about TYPO3 CMS 11.5.21 which was released on 15.12.2022.

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This version is a bugfix and maintenance release. It addresses regressions, that were introduced with previous versions.

Read TYPO3 11.5.21 Release News

Checksums of TYPO3 11.5.21


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The usual upgrading procedure applies. No database updates are necessary. It might be required to clear all caches; the "important actions" section in the TYPO3 Install Tool offers the accordant possibility to do so.


Here is a list of what was fixed since 11.5.20:

  • 2022-12-15 39b888cf24 [RELEASE] Release of TYPO3 11.5.21 (thanks to Oliver Hader)
  • 2022-12-15 678035c7f5 [BUGFIX] Fix absolute backend URL generation in frontend context (thanks to Benjamin Franzke)
  • 2022-12-15 ee661a686a [BUGFIX] Catch any transfer exception in HTTP host header check (thanks to Oliver Hader)
  • 2022-12-14 89da5ba37f [TASK] Remove panel class usage in About module (thanks to Andreas Nedbal)
  • 2022-12-14 36657e2d98 [TASK] Add backward compatibility handling for frontend login signing (thanks to Oliver Hader)
  • 2022-12-14 2fb8b444fb [TASK] Update PHPStan & friends (thanks to Oliver Klee)
  • 2022-12-13 1006f66f53 [BUGFIX] Use correct flag of Zimbabwe (thanks to Andreas Fernandez)
  • 2022-12-13 a66417694f [BUGFIX] Replace undefined variable with locallang key (thanks to Oliver Bartsch)
  • 2022-12-13 9a4fed43c7 [TASK] Set TYPO3 version to 11.5.21-dev (thanks to Oliver Hader)