Moodle 3.1.12 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 3.1.12 release notes
Release date: 17 May 2018
Here is the full list of fixed issues in 3.1.12.
Security issues
A number of security related issues were resolved. Details of these issues will be released after a period of approximately one week to allow system administrators to safely update to the latest version.
