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“If you are logged in to a site that does this, it's a huge danger. Your private account information can be slurped down by ajax on any other sites.”

This is false (unless `Access-Control-Allow-Credentials` is set). See CORS 101: https://annevankesteren.nl/2012/12/cors-101

Seconded. And if you have Access-Control-Allow-Credentials then Access-Control-Allow-Origin must reflect the origin, * is not enough.

It's safe to put Access-Control-Allow-Origin:* on any publicly-accessible server, since another server could simply proxy that stuff anyway.