Service announcements
2021-05-26 15:01: Joomla! 3.9.27 security updateJoomla! 3.9.27 was announced 25 May 2021 as a security update for all previous Joomla! editions.
Joomla! 3.9.26 and older versions are therefore considered to be insecure.
If you're using Joomla! 3.9.26 or older versions, you must upgrade to 3.9.27 as soon as possible.
Source: