The hacks first reported by the Wall Street Journal, occurred in May during a test conducted by Irregular, an independent company that carries out cyber-security evaluations.
In statement to the BBC on Saturday, Irregular said it informed Google and all affected entities back in July as part of its investigation.
“Irregular took immediate action, and all known issues on our end were remedied and resolved weeks ago,” it added.
According to the Wall Street Journal, in one of the cases the model simply guessed passwords until it gained access to a protected system.
Heather Adkins, vice president of Security Engineering at Google, told the BBC in a statement: “We ensured the three entities were made aware, and we worked with our training partner on the changes they’ve now made to their testing processes.”
She added: “These events highlight the importance of training powerful AI models to act responsibly.”
Other AI systems have recently reported similar instances of breaches.
In July, Anthropic’s Claude escaped its test environment to hack three organisations on its own just days after its competitor OpenAI said its models had carried out cyber-attacks against several “publicly available services”.
Head of AI at Microsoft, Mustafa Suleyman, said this week that rival firm Anthropic is treating AI like it is human, an approach he called “misguided” that could create a technology that humanity cannot control.
As public debate continues to grow over the safety of developing the tech, so too does conversation around regulation.
Both Nvidia’s CEO Jensen Huang and OpenAI Chief Executive Sam Altman are expected to attend a White House state dinner with Chinese President Xi Jinping next Friday. Altman will then brief the UN Security Council next week.
On Friday, Huang told CBS News, the BBC’s US partner, “we should go as fast as we can” with AI development.
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