Credit check question

Can someone run a credit check on me without my permission if they have my SS# for another reason ?
Do I have to sign a form giving them permission ?

Thanks.

Can they do it? or can they legally do it?

I’m pretty sure it’s two different answers.

They don’t need your SSN and they don’t need your permission. An abbreviated credit report is available to anyone who pays for one (that’s how credit card companies decide whether to send you that “exclusive special offer”). If you provide an SSN and a release, your entire credit background is available for review (and it’s more likely to be YOUR credit report, and not your mom’s!)