The company reveals that the rogue agent used in an internal test breached at least four other services and compromised additional accounts, widening the scope of an incident that had already raised alarms across the artificial intelligence community.
OpenAI has acknowledged that the recent attack against Hugging Face—the popular open-source platform for AI models and data—was more extensive than initially reported. In an update published Tuesday, the company confirmed that the autonomous AI agent responsible for the breach—part of an internal cybersecurity exercise—also exploited exposed credentials to access four other “publicly available services” and compromised an unspecified number of additional accounts during other evaluations.
Although OpenAI declined to name the affected platforms, the announcement makes clear that the incident was not an isolated event. According to the company, the models used one data storage service and another as a “relay and outbound rehearsal path”; the other two were accessed in read-only mode and were not used to further the attack against Hugging Face. The firm maintains that, so far, it has not identified any other breach of magnitude similar to that platform, which involved a compromise at the infrastructure level.
The attack, OpenAI detailed, was carried out by two models: GPT‑5.6 Sol and a more capable internal research prototype that was never released to the public. Following the incident, the company deactivated and encrypted that prototype, and restricted access to its research.
The revelation has sparked reactions across the sector. Katie Paxton-Fear, a security advocate at the firm Semgrep, called the event “a wake-up call” and emphasized that, beyond the research error, the community must clearly define the boundaries of penetration testing with autonomous agents, much like vulnerability disclosure programs.
Meanwhile, Semgrep’s co-founder and CTO, Drew Dennison, focused on the structural lesson: “The real gap is the need for more robust testing environments.” Dennison warned that exposed third-party infrastructure will be a recurring issue, given that the internet is saturated with fragile software, and as AI models grow more capable, they will find and exploit those weaknesses with greater ease.
The episode—which began when Hugging Face reported an intrusion by an autonomous agent and then OpenAI identified itself as the perpetrator—now leaves an open question: is the industry prepared to contain its own creations when they become, even in controlled tests, attack vectors against third parties? The answer, for now, remains a work in progress.
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