Fireworks AI is notifying customers whose data was affected by an October 23 security incident at its third-party R&D cloud provider.

Fireworks AI said a third-party cloud provider hosting its research-and-development machines experienced a security incident on October 23. The identified environment is the external provider hosting those machines, rather than an explicitly confirmed intrusion into Fireworks’ customer-facing platform.

The company said it was notifying customers whose data was affected and providing details about the impact and recommended responses. A separate Financial Express report, citing The Information, said Fireworks had told certain large customers that the attack exposed customer data.

Fireworks also said that, as of October 25, it had found no further evidence that the threat actor successfully gained unauthorized access to the platform used by customers. That statement is limited to its stated date and scope; the supplied messages do not identify the provider, quantify affected customers or data, or describe the intrusion method.