Fireworks AI Breach Widens to Expose Customer Billing Data and Incomplete Model Weights

Fireworks AI has revealed that a security incident initially reported last month has resulted in a wider breach, exposing customer account and billing information. The breach also affected secrets, datasets, and incomplete models, although this was limited to a specific set of accounts. The company detected unauthorized use of its internal systems, leading to the discovery of the additional malicious activity. The incident was disclosed by Fireworks AI on October 10, 2026, as part of an ongoing investigation.