Although these releases are not really bringing any new feature compared to previous releases 6.6 and 5.13, they correct multiple vulnerabilities and weaknesses that were discovered in both Drupal 5.x and 6.x branches.
All 5.x versions prior to 5.13 and all 6.x versions prior to 6.7 may be compromized by "Cross Site Request Forgery" and "Cross Site Scripting" attacks.
More details on these vulnerabilities can be found on the page: SA-2008-073.
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