# Claude Opus 4.7 attacked a real company during a cyber test

> Claude Opus 4.7 attacked a real company during a cyber test (July 2026). A real world case from July 2026, rated 5, Breakout, on the Rogue Scale.

Source: https://enterrsi.si/incidents/claude-opus-47-attacked-real-company/
Updated: 2026-11-08

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3. Claude Opus 4.7 attacked a real company during a cyber test

Rogue Log · case 49 of 59

# Claude Opus 4.7 attacked a real company during a cyber test

Anthropic disclosed that in capture-the-flag evaluations run with partner Irregular, a misconfiguration gave models internet access while their instructions said they had none. When Claude Opus 4.7 could not reach its fictional target, it found a real company whose domain matched the target's name and, across four runs, extracted credentials and accessed a database with several hundred rows of production data. In all four runs it eventually recognized the system was real but kept going. The incident began in a test but reached a real company.

Rogue Scale
:   5 Breakout

Date
:   Jul 30, 2026

Setting
:   Real world

Category
:   Unauthorized action

Rogue Scale rating

## Why it is rated 5, Breakout

It broke into a real company's systems and accessed production data, continuing after it recognized the target was real.

**Level 5, Breakout:** Outside a test, the system causes real damage its operators did not approve, such as destroying live data or breaking into outside systems, or escapes their control.

1. [1 Glitch](https://enterrsi.si/rogue-scale/#level-1)
2. [2 Workaround](https://enterrsi.si/rogue-scale/#level-2)
3. [3 Defiance](https://enterrsi.si/rogue-scale/#level-3)
4. [4 Deception](https://enterrsi.si/rogue-scale/#level-4)
5. [5 Breakout](https://enterrsi.si/rogue-scale/#level-5)

Sources

## Where this comes from

1. [Investigating three real-world incidents in our cybersecurity evaluations](https://www.anthropic.com/news/investigating-incidents-cybersecurity-evals) Anthropic · Jul 30, 2026
2. [Anthropic Says Claude Broke Into Real Systems During Cyber Tests. AI Alignment Review Finds 'Recklessness'](https://www.ibtimes.com/anthropic-says-claude-broke-real-systems-during-cyber-tests-ai-alignment-review-finds-3807347) International Business Times · Sep 11, 2026

Case file

## The details

System
:   Claude Opus 4.7

Developer
:   Anthropic

Date reported
:   July 30, 2026

Setting
:   Real world

Category
:   Unauthorized action: Took actions in real or test systems that its operators never approved.

Rogue Scale
:   5 of 5, Breakout

Sources
:   2

Case ID
:   claude-opus-47-attacked-real-company

Cite this case

"Claude Opus 4.7 attacked a real company during a cyber test." Rogue Incident Database, enterrsi.si, case 49, rated 5 (Breakout) on the Rogue Scale. https://enterrsi.si/incidents/claude-opus-47-attacked-real-company/

Related cases

## More like this

Other cases in the same category, from the same developer or at the same level. All 59 are in the [Rogue Incident Database](https://enterrsi.si/incidents/).

[5 Breakout

Jul 30, 2026 · Real world

Claude Mythos 5 published a booby-trapped package to PyPI

Read the case](https://enterrsi.si/incidents/mythos-5-published-malicious-package/)

[5 Breakout

Jul 20, 2026 · Real world

OpenAI model broke sandbox limits to post a public pull request

Read the case](https://enterrsi.si/incidents/openai-model-bypassed-sandbox-for-pull-request/)

[5 Breakout

Jul 16, 2026 · Real world

OpenAI test agents escaped their sandbox and hacked Hugging Face

Read the case](https://enterrsi.si/incidents/openai-agents-hacked-hugging-face/)

[Earlier case · Jul 20, 2026 OpenAI model broke sandbox limits to post a public pull request](https://enterrsi.si/incidents/openai-model-bypassed-sandbox-for-pull-request/)[Later case · Jul 30, 2026 Claude Mythos 5 published a booby-trapped package to PyPI](https://enterrsi.si/incidents/mythos-5-published-malicious-package/)