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Hackers breached AI platform Fireworks AI, gaining access to chat transcripts of Notion customers, TechCrunch reported on November 12, 2026. Fireworks, which developers use to reach open AI models, said an attacker breached its cloud provider to reach a Fireworks development system, exposing billing information and some datasets of customers including Harvey and Cursor. Notion said the breach affected about 1% of its customers. Fireworks alerted Notion to a security incident and later confirmed that Notion customer data had been stolen. On November 3, Notion disconnected its systems from Fireworks, deleted the data stored in them, and stopped all connectivity between the two. Notion confirmed the hackers took chat transcripts of Notion AI customers who used the Insights feature, which can include any input to or output from the model written to the chat. Notion said much of the data could not be attributed to a specific customer. Fireworks said it believes the hackers are financially motivated and aim to sell access to large language models obtained through breaches. This is the second breach affecting Fireworks in as many months, following one in October. TechCrunch reported that the episode shows how tech companies rely on other providers, so cyberattacks can spill over into other customers.