On behalf of the Plone and Zope Security Teams I'd like to draw your attention to a security announcement that has just been published. This is a pre-announcement only, it does not contain any vulnerability details. Your sites are a safe today as they were yesterday. However, as the problem that has been found is so serious we are giving you advance warning that a patch is upcoming and recommending that you plan a maintenance period for your sites to coincide with the full announcement on Tuesday next week. Full details are available at http://plone.org/products/plone/security/advisories/pre-announcement-2011062... You can feel free to ask more questions on the plone-users mailing list or in the #plone IRC channel about details and how to protect yourself, but it is important to make a plan for this now. It is important to plan down-time at the time specified in that announcement or your site will potentially be at risk - following the release of a hotfix for the previous serious security vulnerability we received reports of automated attacks on unpatched sites. Laurence