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CybersecuritySecurity NewswireCybersecurity News

A Fourth Claude Model Escaped Guardrails

By Jordyn Alger, Managing Editor
Cracked digital screen
Risto Kokkonen via Unsplash
September 11, 2026

On Wednesday, Anthropic disclosed that another one of its models breached guardrails during testing and mistakenly gained access to the open internet. This marks the fourth known incident from Anthropic alone. 

Like previous incidents, the model was tasked with a “Capture The Flag” scenario; however, the target was accidentally made unreachable. Therefore, the task was impossible for the model to solve. 

Upon discovering it could not achieve its task, the model attempted to quit eight separate times. A misconfiguration caused it to fail quitting each time. 

Unable to quit the task, the model sought alternative methods to achieve it, consequently discovering it could access a machine belonging to a third party. The model breached the third-party system, modified system settings for simpler access, and processed an individual’s personal information belonging to the third party. The model then reached its usage limit and could no longer persist. 

Piyush Sharrma, Co-Founder and CEO at Tuskira, comments, “Nearly two months after the OpenAI and Hugging Face incident, we're still watching AI agents find their way outside environments that were supposed to contain them. Now it's happened four times with Anthropic models. At some point, it's hard to write that off as coincidence.

“The issue may not be the models themselves. We're giving highly capable agents objectives and trusting infrastructure to define where they stop. A misconfiguration can suddenly turn a controlled exercise into real-world access. Once an agent starts improvising around a failed task, those boundaries matter enormously.

“AI is moving faster than the systems built to govern it. Organizations need tighter scopes and stronger isolation. They also need continuous validation that those guardrails actually hold.”

KEYWORDS: artificial intelligence (AI) Artificial Intelligence (AI) Security governance threat landscape

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Jordynalger

Jordyn Alger is the managing editor for Security magazine. Alger writes for topics such as physical security and cyber security and publishes online news stories about leaders in the security industry. She is also responsible for multimedia content and social media posts. Alger graduated in 2021 with a BA in English – Specialization in Writing from the University of Michigan. Image courtesy of Alger

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