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Thu, September 18, 2025

ShadowLeak: AI agents can exfiltrate data undetected

⚠️Researchers at Radware disclosed a vulnerability called ShadowLeak in the Deep Research module of ChatGPT that lets hidden, attacker-crafted instructions embedded in emails coerce an AI agent to exfiltrate sensitive data. The indirect prompt-injection technique hides commands using tiny fonts, white-on-white text or metadata and instructs the agent to encode and transmit results (for example, Base64-encoded lists of names and credit cards) to an attacker-controlled URL. Radware says the key risk is that exfiltration can occur from the model’s cloud backend, making detection by the affected organization very difficult; OpenAI was notified and implemented a fix, and Radware found the patch effective in subsequent tests.

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