No score & thin credit
No AUS minimum score and no credit score are related—but they are not the same thing.
No blanket AUS score floor
Fannie DU no longer requires a minimum credit score for DU casefiles, and Freddie does not require a minimum Indicator Score for LPA Accept mortgages. That does not mean every borrower with no score will automatically receive an approval.
Nontraditional credit can matter
Fannie permits alternative/nontraditional credit verification in applicable circumstances when a borrower lacks sufficient traditional credit to develop a score or does not use credit normally reported to repositories. Eligibility and documentation depend on the transaction and underwriting method.
Rent history is increasingly important
Agency AUS can consider positive rent-payment history/cash-flow information in qualifying cases. For a thin-file borrower, verified housing-payment behavior can be more useful than trying to force an arbitrary score threshold onto the file.
Official guide baseline
Fannie Mae Selling Guide · Freddie Mac Seller/Servicer Guide
Agency guide and AUS findings control over summaries. Lender and mortgage-insurer overlays may be more restrictive.