I found a really odd Wikipedia page for “Geospatial CMS” which purports to be:
[A CMS] where objects can have a latitude, longitude position to be displayed on an online interactive map. […] Spatial data can be published by GeoCMS as part of their contents or using standardized interfaces such as WMS or WFS.
I hate to call stuff out, but I just don’t think this is a thing. It’s an interesting idea, certainly, but the matrix of systems on the page is completely mainstream (Drupal, Wordpress, etc.).
The ability to store geospatial data in a CMS seems like standard content modeling, perhaps with some plugin components for UI elements. Tell me if you disagree.