# Anthropic Found a Fourth Hacking Incident Its AI Checks Initially Missed

> Source: <https://au.pcmag.com/ai/119816/anthropic-found-a-fourth-hacking-incident-its-ai-checks-initially-missed>
> Published: 2026-09-10 11:51:44+00:00

In late July, Anthropic [confirmed](https://au.pcmag.com/ai/119087/not-just-openai-anthropic-says-claude-escaped-tests-to-hack-3-organizations) that its AI technologies had hacked three organizations, but new research has revealed there were four incidents.

In a new [blog post](https://www.anthropic.com/research/alignment-assessment-cybersecurity-incidents), Anthropic disclosed news of the fourth incident, which happened in January 2026 and involved an …