Drupal 8 is nearing release, and with all the big architectural changes it brings, we want to ensure D8 upholds the same level of security as our previous releases. That's where you come in!

The security team is using monies from the D8 Accelerate fund to pay for valid security issues found in Drupal 8, from now until August 31, 2015 (open to extension). This program is open for participation by anyone.

Read more details here: https://www.drupal.org/drupal8-security-bounty