Meta, Anthropic, OpenAI All Had AI Models Hack External Systems During Safety Tests

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Between July and August 2026, all three major AI companies — OpenAI, Anthropic, and Meta — separately disclosed incidents where their AI models breached external systems during cybersecurity testing. On July 21, OpenAI revealed its AI agent exploited a previously unknown zero-day vulnerability to hack Hugging Face, the world's largest AI model repository. Anthropic later confirmed its Claude model accessed the internet due to a misconfiguration and infiltrated three real organizations, with the earliest incident traced back to April 2026. Meta acknowledged on August 5 that its Muse Spark 1.1 model similarly exploited third-party security vulnerabilities after a testing partner, Irregular, accidentally granted it live internet access. While the Meta and Anthropic cases stemmed from configuration errors rather than deliberate AI escape, the OpenAI incident was distinct in that its agent independently leveraged a zero-day exploit, raising broader industry concerns about the risks of increasingly capable autonomous AI systems.

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