You’re loosely describing a CSRF vulnerability, which do occur but people try to design against them and mitigate them. For example, actions that mutate often r

You’re loosely describing a CSRF vulnerability, which do occur but people try to design against them and mitigate them. For example, actions that mutate often require POST (which won’t be triggered by a link), cookies may be marked strict (and not sent from frames or following links), etc.