---
title: Hackers Reached Fireworks AI Customers' Billing Data and Some Model Weights, a Wider Breach Than First Disclosed
description: Fireworks AI says attackers reached billing data and, for some accounts, datasets and incomplete model weights, through a hacked cloud provider.
author: Darie Nani (Editor-in-Chief)
date: 2026-11-10T11:26:00.299Z
updated: 2026-11-10T11:26:00.315Z
canonical: https://www.sovereignmagazine.com/article/fireworks-ai-second-breach-customer-data
image: https://cdn.nanimediahouse.com/pexels-an-it-professional-operates-a-computer-in-a-server-room-mana-37605911.jpg
categories: Artificial Intelligence
content_type: News
region: Global
publication: Sovereign Magazine
access: members
schema_type: Article
about:
  - type: Organization
    name: Fireworks AI
    description: Fireworks AI runs and fine-tunes open AI models in production for businesses.
    url: https://fireworks.ai
---

Fireworks AI says the hackers who broke into its systems in October reached customers' account and billing information and, for a limited set of accounts, stored secrets, datasets and incomplete model weights, a wider breach than the company described in its first disclosure a month ago.

Fireworks set out the new findings in an [updated security bulletin](https://fireworks.ai/security/bulletins/october-2026-security-incident-update) dated November 9. It has told large customers, including the legal AI company Harvey, about the more serious breach, The Information reported on Monday, and some customers that spend millions of dollars a year on the platform are weighing moving their business elsewhere, according to one person the publication cited. Harvey says none of its customers' data was affected, The Information reported, and it is not clear whether other clients such as Notion, Vercel or Cursor were hit.

Fireworks, which runs open-source AI models for businesses, has more than 10,000 customers, according to media reports. In September [we reported its talks to raise money at a valuation of $30 billion](https://www.sovereignmagazine.com/article/fal-fireworks-inference-valuations-15b-30b).

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