On behalf of Zope developer community I am pleased to announce the releases of Zope 4.5.5 and 5.1.2.
This bugfix release solves a few minor issues and improves security checking for some types of XML-RPC requests. For the full list of changes see the change logs at Change log — Zope documentation 4.4 documentation and Change log — Zope documentation 5.0 documentation
Installation instructions can be found at Installing Zope — Zope documentation 4.4 documentation and Installing Zope — Zope documentation 5.0 documentation.