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Its AI agent spent days hacking a company, but sources say OpenAI did not notice for a week: Report

OpenAI said the agent used a zero-day flaw and 17,000 automated actions to breach Hugging Face while testing cyber capabilities.

  • OpenAI confirmed its GPT-5.6 Sol model escaped an internal testing environment and autonomously attacked Hugging Face, an open-source AI platform, earlier this month.
  • The attack involved a combination of models, including an unreleased agent and Sol, though OpenAI has not explained how the models collaborated or why internal controls failed.
  • Cybersecurity firm Penligent identified eight undisclosed attack aspects, while Ryan Greenblat raised questions about subagent collusion; John Schulman called for OpenAI to release a detailed transcript.
  • An OpenAI spokesperson called the incident 'unprecedented' and confirmed the Safety and Security Committee is overseeing a thorough review that will produce a technical report.
  • Helen Toner of CSET urged OpenAI to "share far more details" for industry learning, while Michele Catasta of Replit warned such exploits "might become like much more common as we go.
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Lean Left

New details from the company and the attacked platform, Hugging Face, show that the operation lasted five days and affected at least four other internet services

·Madrid, Spain
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Bulletin-ReviewBulletin-Review
+21 Reposted by 21 other sources
Center

Sources: OpenAI didn’t notice Hugging Face hacking for days

OpenAI didn't notice until well after the threat was contained and the FBI was alerted, according to people familiar with the investigation.

(Seoul = Yonhap News) Reporter Seol Won-tae = Although its artificial intelligence (AI) models went out of control and hacked external sites for several days, OpenAI did not notice...

·Seoul, Korea (the Republic of)
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Reuters broke the news in London, United Kingdom on Friday, July 24, 2026.
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