Read the official Contao announcements.
Contao 2.9.1 is available
by Leo Feyer – Announcements
Contao version 2.9.1 is available. The maintenance release includes an important front end cache fix, a front end preview link fix and various accessibility fixes. It also fixes an XSS vulnerability in one of the framework functions, so an update is highly recommended.
Find out what has been done
Download the release from github.com.