According to this documentation:
Changing /cxf servlet alias
By default CXF Servlet is assigned a '/cxf' alias. You can change it in a couple of ways:
a. Add org.apache.cxf.osgi.cfg to the /etc directory and set the 'org.apache.cxf.servlet.context' property, for example:
org.apache.cxf.servlet.context=/custom
b. Use shell config commands, for example :
config:edit org.apache.cxf.osgi config:propset org.apache.cxf.servlet.context /super config:update