Plone is a free and open source content management system, and is ranked among the top 2% of all open source projects worldwide. More than 350 solution providers in more than 100 countries currently support it. The project has been actively developed since 2001, is available in more than 40 languages, and has the best security track record of any major CMS. The users (https://plone.com/about/they-use-plone) include the Federal Bureau of Investigation (FBI), the Central Intelligence Agency (CIA), the Intellectual Property Rights Center, and so on.
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Article Link: https://blog.fortinet.com/2017/12/05/multiple-plone-cross-site-scripting-vulnerabilities