Is Plone secure?
Plone offers superior security without sacrificing power or extensibility.
As an open source product, a large number of developers frequently scrutinize the code for any potential security issues. This proactive approach is better than the wait-and-see approach in proprietary software that relies on keeping security issues a secret instead of resolving them outright.
Built on Python and Zope, which are highly secure platforms, Plone has a technological edge that has helped it attain the best security track record of any major CMS (Source: CVE).
And because of its object-oriented backend, Plone isn’t vulnerable to SQL Injection attacks, which are one of the most common security problems that affect PHP/MySQL-based systems. Plone’s flexible ACL system for user permissions also helps ensures that users only see the content that they’re supposed to.
In fact, security is a major reason why many CMS users are switching to Plone.