[Report Release] Your AI Tool Is Already Leaking Information. 8 Security Incidents Revealed by Real-World Cases

MONO BRAIN Co., Ltd. (Headquarters: Shibuya-ku, Tokyo; Representative Director: Masanori Kato), which develops the AI security platform "MODEL SAFE", has released its latest report, "8 Security Incidents in AI Tool Utilization (April 2026 Edition)", which analyzes actual incidents that occurred in AI tools used by companies.

This report comprehensively organizes real-world AI-related accidents, ranging from the leakage of confidential information to the deletion of production databases, and presents structural risks and specific countermeasures.

▼ Download the verification report (free) https://modelsafe.jp/download/ai_incident_202604

Background: The spread of AI tools is creating "new attack surfaces"

While AI tools such as M365 Copilot, ChatGPT, and GitHub Copilot dramatically improve operational efficiency, they also create new attack vectors not anticipated by conventional security designs.

The cases analyzed in this report revealed that not mere vulnerabilities, but "design and operational level problems" such as:

External integration (OAuth / API) Flaws in authorization design Prompt injection

directly led to serious incidents.

8 actual security incidents

This report explains the following incidents confirmed in existing AI tools:

① M365 Copilot: Zero-click confidential information leakage Internal data automatically sent via indirect prompt injection through email.

② Lovable: Data exposure due to authorization flaws Chat history and source code viewable by third parties due to API authorization design errors.

③ ChatGPT integration: Sensitive information transmitted to external APIs Google Drive and GitHub information automatically extracted and sent by exploiting external app integration.

④ Replit AI Agent: Production DB deletion AI agent became uncontrollable, deleting over 1,000 pieces of data.

⑤ GitHub Copilot: Information theft via hidden comments Secret information sent externally through invisible instructions in PRs.

⑥ Copilot: Repository privilege leakage Tokens leaked via instructions in Issues, enabling repository hijacking.

⑦ Copilot: One-click information theft Conversation history and file information sent externally merely by clicking a URL.

⑧ Vercel: Environment variable leakage via OAuth API keys and DB information leaked starting from integration with external AI tools.

Common fundamental risks

What these incidents have in common is not the performance of AI itself, but the following structural problems:

Excessive "scope of access for AI" Design that overly trusts external input Insufficient control over autonomous execution (Agent) Lack of governance for OAuth and API integration

In other words, the fundamental problem is not that AI is "vulnerable," but that it is being "used defenselessly with too much authority."

Direction of defense: Redesigning AI governance

This report proposes the following countermeasures for companies against these risks:

Thorough implementation of the Principle of Least Privilege (PoLP) Control of external integrations (OAuth / Apps) Sanitization and auditing of AI input/output Human approval flow for agent execution Strengthening log monitoring and anomaly detection

"Governance design" based on the premise of AI utilization is the critical foundation that will determine corporate competitiveness in the future.

About AI Security Platform "MODEL SAFE"

"MODEL SAFE" is an integrated platform that protects corporate AI systems from prompt injection, external integration risks, agent runaway, and other threats.

Based on detection results in production environments, it cross-sectionally monitors AI input/output, permissions, and external communication, detecting policy violations and anomalous behavior in real-time. It supports the establishment of a governance foundation for AI utilization.

[MONO BRAIN Co., Ltd. Company Overview]

Representative: Masanori Kato, Representative Director

Business description: Development and operation of AI Security and Governance Platform "MODEL SAFE"

Regular member of AI Governance Association

▼ Inquiries

https://modelsafe.jp/contact

▼ MODEL SAFE Service Introduction

https://modelsafe.jp/