Fireworks AI Confirms Wider Breach Affecting Customer Datasets, Model Weights and Notion AI Chats

Fireworks AI confirmed a data breach that began with unauthorized access to internal credentials, leading to broader compromise of customer datasets, model weights, and billing information. Attackers accessed the company's development environment via a third-party cloud provider and ran unauthorized workloads between October 23 and October 25, 2026. The breach also impacted Notion AI, exposing chat transcripts from the Insights feature for fewer than 1% of workspaces. Fireworks AI attributed the activity to a financially motivated threat actor group conducting 'LLMjacking'—stealing access to large language models to resell illicitly.

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