I know this is some serious thread necromancy, and I apologize for that. 
Google shows this result prominently for this subject.

How is this a security flaw?  Login only succeeds if the credentials are 
> correct. If someone has credientials, they can login to the site, and I 
> don't see what role forged cross-site requests play in this case.
>

It is a security flaw because an attacker can force a user to login with 
credentials under his control, and use that to attempt to get a user to 
give up some form of sensitive information. It's pretty far-fetched, but 
not completely inconceivable.

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