Accessing private content via str.format in through-the-web templates and scripts in Plone 2.5-5.1rc1. This improves an earlier hotfix. Since the format method was introduced in Python 2.6, this part of the hotfix is only relevant for Plone 4 and 5. References: https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-1000483