This is also the name of a UseMod fork which implements this; see http://purl.net/net/cpw.
SelfProgrammingWiki was another name for this concept (because, from the initial developer's point of view, once you write a CommunityProgrammedWiki, you could sit back and watch the wiki "program itself"!)
See also PublicScript. PublicScript is the generic idea of a web application whose script is modified by the community. This page is the specialization of that idea to wikis.
[CategoryUncommonWikiTechnology] [CategoryWikiTechnology] [CategoryWikiEngine]