From Mageia wiki
Updates advisories are managed using mgaadv. This page explains how to create an updates advisory.
SVN access
To be able to add or edit advisories, you need to have commit access to the svn server. So you must be in the packagers or QA ldap group. You also need to setup your ssh key to be able to access the svn (see Packagers_ssh for details). The following command should work :
$ svn ls svn+ssh://svn.mageia.org/svn/advisories/
Installation
The first step to create advisories is to install the package mga-advisories :
# urpmi mga-advisories