Anthropic Leaked Its Own AI Model – Because Even AI Companies Don’t Know What Data They’re Exposing

A company building the world’s most capable AI model left thousands of sensitive internal files in a publicly searchable data store. No sophisticated attacker was involved. No credentials were stolen. The data simply sat in the wrong place, with nothing in place to detect it. In late March 2026, a security researcher at LayerX Security found nearly 3,000 unpublished Anthropic documents, including…