Plone 2.5.1 and 2.1.4
Plone put has our provision two new releases of the series 2.5.x and 2.1.x with improvements of policy of defect to avoid the attacks of Spam which some sites of Plone were a victim recently.
This is a required upgrade for all Plone sites.
Not all sites are affected (the attacks have mostly been against a few
high-profile Plone sites like plone.org itself), but you should make
sure you are protected against potential spammers in the future.
Plone 2.1.4
Plone 2.5.1
