AI Startup Breaches Anthropic's Internal Systems in Just 12 Hours, Exposing Sensitive Data

10/27/2026

Cybersecurity startup Cathedral reportedly used autonomous AI agents to access parts of Anthropic's internal business systems, including HR records and Slack messages. The incident has renewed...

10/27/2026

Anthropic says it disabled the access pathways on the same day once the activity was flagged by its monitoring systems.

10/26/2026

Cathedral, a startup founded by ex-DOGE staffers, says its AI agents found paths into Anthropic's sales, HR, and IT systems through third-party software.

10/26/2026

A cybersecurity startup called Cathedral gained access to sensitive internal systems at Anthropic in less than 12 hours, exposing employee information, salary details, job offers and internal...

10/26/2026

An AI cybersecurity startup founded by former DOGE staffers used AI agents to gain access to sensitive internal systems at Anthropic, the company behind Claude, in less than 12 hours, exposing...

10/26/2026

Cathedral accessed systems with internal Slack messages and employee data, under an Anthropic security testing program, a report reviewed by

10/26/2026

A security test by outside researchers exposed weaknesses in Anthropic's internal business software, raising questions about third-party security risks as the company faces scrutiny over other...

10/26/2026

The AI agents took less than 12 hours to hack into Anthropic, the report says.