Spree is an open source e-commerce solution built with Ruby on Rails. Prior to versions 4.10.2, 5.0.7, 5.1.9, and 5.2.5, an Unauthenticated Insecure Direct Object Reference (IDOR) vulnerability was identified that allows an unauthenticated attacker to access guest address information without supplying valid credentials or session cookies. This issue has been patched in versions 4.10.2, 5.0.7, 5.1.9, and 5.2.5.

Spree API has Unauthenticated IDOR - Guest Address