Moodle 3.9.11 release notes
From MoodleDocs
This version of Moodle is no longer supported for general bug fixes. You are encouraged to upgrade to a supported version of Moodle.
Releases > Moodle 3.9.11 release notes
Release date: 8 November 2021
Here is the full list of fixed issues in 3.9.11.
Backported bug fixes
Security fixes
Details of any security issues will be released after a period of approximately one week to allow system administrators to safely update to the latest version.