As we noted previously, there was a major Django security release announced. We're following that up with a new Review Board 1.7.14 release.
Along with updating to the latest Django release, we're also fixing a security issue in the API that affects those using access control on repositories and groups. It's possible to craft an API request that fetches reviews and some other information on review requests that shouldn't be accessible.
There's also support for Team accounts on Bitbucket, and a small handful of bug fixes.
See the release notes for more information.