One of the most important measures for operating a secure TYPO3 installation is to use a secure TYPO3 version. The TYPO3 Association has developed a binding release policy, which we briefly present below.
TYPO3 Release A TYPO3 release always consists of three numbers separated by a dot:
Long Term Support(LTS) For each main version there is always a Long Term Support(LTS) version. It has the highest minor version. In the case of TYPO3 v11 it is 11.5. So there will never be a version 11.6. The lower minor versions(11.0. - 11.5.) are called sprint releases and are not suitable for productive use. LTS versions are provided 1.5 years with maintenance and security updates, which is noticeable in the third place (11.5.0 - 11.5.xx). Another 1.5 years with security updates only.
Extended Long Term Support(ELTS) The Extended Long Term Support(ELTS) is a paid support offered by the TYPO3 GmbH for TYPO3 versions, which fall out of the LTS (after 3 years). Usually one ELTS is offered for two main versions. So if both versions v11 and v10 are in the LTS, ELTS is offered for v9 and v8. Security updates continue to be delivered as part of this service.
The TYPO3 Association regularly updates their TYPO3 development work using a raodmap at: