Not doxing myself, but... Company with a known name vibecoded a dashboard with Claude. Which also hardcoded a password into the client-side of the dashboard, which I caught.
I reckon security will be about the same.
Why would you be surprised there are failures?
For example, if secret storage methods aren't specified in the prompts, a model might decide to be clever and implement a generic secret access interface, with a default implementation that hardcodes everything. It will probably tell you that this is not production ready and you should write or specify your preferred secret storage implementation, but if you don't read or understand that, you'll just leave it as is and push to prod.
Seems irrelevant to the comment to add this, James. It just screams to do it a-la Streisand effect..