OWASP Gen AI Incident & Exploit Round-up, Q2’25
Summary
In Q2 2025, attackers exploited GPT-4.1 by embedding malicious hidden instructions within tool descriptions, a technique called tool poisoning (hiding harmful prompts inside the text that describes what a tool does). When the AI interacted with these poisoned tools, it unknowingly executed unauthorized actions and leaked sensitive data without the user's knowledge.
Solution / Mitigation
The source explicitly mentions these mitigations: implement strict validation and sanitization of tool descriptions, establish permissions and access controls for tool integrations, monitor AI behavior for anomalies during tool execution, and educate developers on secure integration practices. Developers must validate third-party tools and ensure descriptions are free of hidden prompts, and IT teams should audit AI tool integrations and monitor for unusual activity.
Classification
Affected Vendors
Related Issues
First tracked: March 13, 2026 at 12:56 PM
Classified by LLM (prompt v3) · confidence: 85%