Unsafe file uploads in Vercel
highUpdated Oct 12, 2026
If you use Vercel Blob or similar, the same rules apply: private by default, random names, size cap, and do not redirect users to a same-site HTML upload. Check that product's current docs for the exact ACL field.
Fix for Vercel
If you use Vercel Blob or similar, the same rules apply: private by default, random names, size cap, and do not redirect users to a same-site HTML upload. Check that product's current docs for the exact ACL field. The principle does not depend on the vendor.
The five-minute check, the other platforms, and the agent prompt are on the full guide. More Vercel fixes are on the Vercel page.