I don't think openclaw can possibly be secured given the current paradigm. It has access to your personal stuff (that's its main use case), access to the net, and it gets untrusted third party inputs. That's the unfixable trifecta right there. No amount of filtering band-aid whack-a-mole is going to fix that.

Sandboxes are a good measure for things like Claude Code or Amp. I use a bubblewrap wrapper to make sure it can't read $HOME or access my ssh keys. And even there, you have to make sure you don't give the bot write access to files you'll be executing outside the sandbox.