On the Symfony blog the project has made an announcement about a new addition to the Symfony team to help handle security issues around the framework: Michael Cullum

Handling security issues responsibly and transparently is key to the success of any Open-Source project. Symfony is no exception. We documented the process of our security management policy a long time ago.

[...] Today, I'm very happy and proud to announce that we are getting to the next level. Michael Cullum accepted to join the Symfony Core Team to lead the security team. He will be responsible for managing the security process.

Michael is the secretary of the PHP-FIG group, represents the PHPBB project and is a heavy user of the Symfony framework. Having Michael on the team means that there will be a central point of contact and someone whose primary role is ensuring the safety and security of the overall project and framework.