Fireworks AI updated its October security incident bulletin on November 9, saying that beyond previously known stored secrets it found impact to account and billing information, plus secrets, datasets and incomplete models for a limited set of accounts, with evidence pointing to a financially motivated cybercriminal group engaged in LLMJacking [1]. The company says a third-party cloud provider hosting its R&D machines had a security incident on October 23, which an unauthorized party used on October 24 to reach Fireworks development machines and run an unauthorized workload; exposed data includes resource metadata and billing and shipping addresses, invoices and payment history, while card numbers were not stored and not affected [1][2]. Fireworks customers should replace revoked API keys per their notice, rotate listed third-party credentials with their issuers, and check accounts for unrecognized keys, users, training jobs and datasets [3].
AI inference platform Fireworks reports second breach exposing billing data and some customer model weights and datasets
1 min read
- Disclosed
- Oct 9, 2026
- Published
- Nov 10, 2026
- Last updated
- Nov 12, 2026
- CVSS basis
- Our assessment
- Technology
- Attack vector
- Impact
- Data type
- Actor type
- Motivation
On this page
30-second summary
What happened
Who is affected
Industries mainly affected: Technology
What to do nowOur advice
Fireworks customers should replace revoked API keys per their notice, rotate listed third-party credentials with their issuers, and check accounts for unrecognized keys, users, training jobs and datasets
Timeline
Technical details
Remediation
Vendor guidance
- 1Replace keys and rotate credentials mitigate[3]
Create new API keys per the notice and rotate listed third-party credentials with their issuers.
- 2Check for unrecognized resources detect[3]
Review API keys, users, evaluators, training jobs and datasets for anything unrecognized and report it to Fireworks.
References
Official / primary2
- [1]
“The evidence indicates links to a cybercriminal threat actor group, which is financially motivated and aimed at selling tokens from unauthorized access to Large Language Models (LLMs) to illicit routing gateways, known as "LLMJacking".”
- [3]Fireworks AI
This site aggregates public information and is not security consulting advice. Test remediation steps before applying.