This was flagged as a potential issue during Bug 1102836 - AUDIT-0: xpra: suse-dbus-unauthorized-service org.xpra.Server a security review of xpra for packaging into suse.
FWIW: all the information exposed should normally already be accessible to all users on the system, but it is possible that we expose some internal attributes that should not be - difficult to tell, so let's err on the side of caution.
Done in r20186, r20187 backport for the v2.3.x branch.
Sample output from d-feet:
{'mode': 'proxy', 'python': {'version': '3.6.6'}, 'session-type': 'proxy', 'start_time': 65850, 'type': 'Python', 'uuid': 'ade8405288844b92aeddd5c073cd7097'}
this ticket has been moved to: https://github.com/Xpra-org/xpra/issues/1939