A vulnerability in Plone 2.5 to Plone 4.0 that allows anonymous users to gain manager access to a Plone site. This is an escalation of privileges attack that can be used by anonymous users to gain access to a Plone site's administration controls, view unpublished content, create new content and modify a site's skin. The sandbox protecting access to the underlying system is still in place, and it does not grant access to other applications running on the same Zope instance.
Upstream has released a hotfix: http://plone.org/products/plone-hotfix/releases/CVE-2011-0720/
CVE-2011-0720 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2011-0720): Unspecified vulnerability in Plone 2.5 through 4.0, as used in Conga, luci, and possibly other products, allows remote attackers to obtain administrative access, read or create arbitrary content, and change the site skin via unknown vectors.
Plone is long gone from tree.
