FlexWiki has always supported application-wide security by virtue of being an ASP.NET application. However, previous to version 2.0 of FlexWiki, security was an all-or-nothing proposition: either all topics in the wiki were accessable to a particular user, or none were. (Note: this is only somewhat true, but certainly fine-grained control was difficult or impossible.)

In FlexWiki 2.0, support for topic-level security has been added. Administrators and users can now restrict access on a per-user, per-topic basis. Support is also present for wiki-wide and namespace-level defaults.

Security in FlexWiki 2.0 consists of three separate, independent pieces: authentication, authorization, and transport security. You can read about them under FlexWikiAuthentication, FlexWikiAuthorization, and FlexWikiTransportSecurity, respectively.

The FlexWiki security features were implemented by CraigAndera with support from the FlexWiki community.