As of today, the bounties for this program have been doubled. This program is part of the European Commission's ISA² project. We hope that the increased reward will encourage researchers to spend more time investigating Matrix, open source software widely used by European Public Services.
Since launching the bounty programme, Matrix has added support for many Social Login Providers (Google, Facebook, GitHub, etc.), and we'd especially appreciate scrutiny of these modules, both in the Matrix clients and in the Synapse server.