The Django project just announced a new set of security releases. We're putting out a matching Review Board 1.7.25 release that pulls these in, plus fixes for Active Directory and some documentation.
We recommend that everybody running 1.7.x updates to 1.7.25. If you're not ready to upgrade Review Board yet, you can instead upgrade to the new Django release by running:
$ sudo easy_install Django==1.4.11
If you're running the Review Board 2.0 RCs, you can instead upgrade Django by running:
$ sudo easy_install Django==1.6.3
The final Review Board 2.0 release will include these fixes.
See the release notes for the complete list of fixes.