AI Firm Braintrust Prompts API Key Rotation After Data Breach

AI evaluation and observability platform Braintrust urged customers this week to rotate API keys that may have been compromised after hackers accessed an AWS account. The incident, the company says, was discovered on May 4, after receiving a report of suspicious behavior, and was communicated to customers via email on May 5. The message also included indicators of compromise (IOCs) and remediation steps. Immediately after learning of the incident, Braintrust locked down the compromised account, audited related systems and restricted access to them, rotated internal secrets, and launched an investigation into the matter. The internal AWS account used by its systems, Braintrust says, likely provided the attackers with access to API keys that organizations use to access AI models. “As a precaution, we recommend that all customers rotate any org-level AI provider keys used with Braintrust,” the company said in an incident notice. According to the company, at least one customer has been affected by the incident, with three other customers reporting suspicious spikes in AI provider usage. “We have not identified broader customer exposure based on our investigation to date, but as a precaution we informed all org admins with stored AI provider secrets in Braintrust. The investigation is ongoing,” the company says. Braintrust recommends that customers access their org-level settings page, delete or revoke the existing secrets, configure new secrets, and confirm that they were rotated by checking their timestamps. The org-level AI provider API keys potentially exposed in the incident were likely stored for AI-forward companies such as Box, Cloudflare, Dropbox, Notion, Ramp, Stripe, and others, Nudge Security CTO Jaime Blasco told SecurityWeek. “The blast radius isn’t Braintrust, it’s every downstream customer’s AI stack, and a single SaaS compromise fans out across dozens of LLM provider accounts. This is the new shape of supply chain risk: every AI eval, observability, and gateway tool a company adopts becomes a credential warehouse, and those warehouses are now a tier-one target,” Blasco said. Related: Edtech Firm Instructure Discloses Data Breach Amid Hacker Leak Threats Related: Vimeo Confirms User and Customer Data Breach Related: Luxury Cosmetics Giant Rituals Discloses Data Breach Related: Medtronic Hack Confirmed After ShinyHunters Threatens Data Leak WRITTEN BY Ionut Arghire Ionut Arghire is an international correspondent for SecurityWeek. More from Ionut Arghire Boost Security Raises $4 Million for SDLC Defense Platform Chrome 148 Rolls Out With 127 Security Fixes Vendor Says Daemon Tools Supply Chain Attack Contained Cisco Patches High-Severity Vulnerabilities in Enterprise Products Gemini CLI Vulnerability Could Have Led to Code Execution, Supply Chain Attack Herd Security Raises $3 Million for AI-Powered Training Platform Iranian APT Intrusion Masquerades as Chaos Ransomware Attack Sophisticated Quasar Linux RAT Targets Software Developers Latest News In Other News: Train Hacker Arrested, PamDOORa Linux Backdoor, New CISA Director Frontrunner Polish Security Agency Reports ICS Breaches at Five Water Treatment Plants Cyberattack Hits Canvas System Used by Thousands of Schools as Finals Loom ‘PCPJack’ Worm Removes TeamPCP Infections, Steals Credentials Ransomware Group Takes Credit for Trellix Hack Vulnerability in Claude Extension for Chrome Exposes AI Agent to Takeover Ivanti Patches EPMM Zero-Day Exploited in Targeted Attacks Worries About AI’s Risks to Humanity Loom Over the Trial Pitting Musk Against OpenAI’s Leaders Trending Webinar: ROSI For CPS Security Programs May 13, 2026 In cyber-physical systems (CPS), just one hour of downtime can outweigh an entire annual security budget. Learn how to master the Return on Security Investment (ROSI) to align security goals with the bottom-line priorities. Register Virtual Event: Threat Detection And Incident Response Summit May 20, 2026 Delve into big-picture strategies to reduce attack surfaces, improve patch management, conduct post-incident forensics, and tools and tricks needed in a modern organization. Register People on the Move Malwarebytes has named Chung Ip as Chief Financial Officer. Semperis has appointed John Podboy as Chief Information Security Officer. Randy Menon has become Chief Product and Marketing Officer at One Identity. More People On The Move Expert Insights The Mythos Moment: Enterprises Must Fight Agents With Agents Only with the right platform and an agentic, AI-driven defense, will enterprises be able to protect themselves in the agentic era. (Etay Maor) Why Cybersecurity Must Rethink Defense In The Age Of Autonomous Agents From autonomous code generation to decision-making systems that initiate actions without human intervention, the industry is entering a new phase. (Torsten George) Government Can’t Win The Cyber War Without The Private Sector Securing national resilience now depends on faster, deeper partnerships with the private sector. (Steve Durbin) The Hidden ROI Of Visibility: Better Decisions, Better Behavior, Better Security Beyond monitoring and compliance, visibility acts as a powerful deterrent, shaping user behavior, improving collaboration, and enabling more accurate, data-driven security decisions. (Joshua Goldfarb) The New Rules Of Engagement: Matching Agentic Attack Speed The cybersecurity response to AI-enabled nation-state threats cannot be incremental. It must be architectural. (Nadir Izrael) Flipboard Reddit Whatsapp Email