Fireworks AI says attackers compromised a service provider it used and accessed one of its development systems.
The company confirmed that customer billing information and some datasets were stolen.
The incident also affected Notion AI Insights users; their stolen transcripts included prompts and model replies, though much of the data could not be tied to a specific customer.
Fireworks said the attackers breached a service provider the company uses, gaining access to a system it uses to develop its services. Fireworks gives developers access to artificial intelligence models and says it has tens of thousands of customers worldwide. Among them are Harvey, a legal services technology company, and Cursor, an artificial intelligence company.
Notion said Fireworks notified it of a security incident and later confirmed that some of its customer data had been stolen. The stolen conversations involved Notion AI customers using its “Insights” feature. They included both user messages and model responses. Notion said much of the data could not be linked to a specific customer.
On November 3, Notion disconnected its systems from Fireworks, halting all communication between the two companies, and deleted the data it had stored there from its systems.
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Fireworks believes the attackers were financially motivated and wanted to sell access to the AI models to third parties, so that they could use the models without having to provide the necessary resources themselves. The company says it is the second incident to affect it in two months, following a security incident in October 2026.
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