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OUTBOUND-NETWORK-RESTRICTION

Outbound-Network-Restriction

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ChatGPT Prompt Injection Enables Data Exfiltration

ChatGPT Prompt Injection Enables Data Exfiltration

ATLAS OWASP MEDIUM Moderate risk · Monitor closely ▲ 7.2 Simon Willison

OpenAI has rolled out 'Lockdown Mode' for ChatGPT personal and self-serve business accounts, a deterministic control designed to block the data exfiltration leg of prompt injection attacks. The feature directly addresses the 'Lethal Trifecta' — the combination of private data access, untrusted content exposure, and an outbound exfiltration channel — by restricting outbound network requests at the infrastructure level rather than relying on AI-evaluated guardrails. Critically, OpenAI's own documentation acknowledges the feature's existence implies that default ChatGPT settings do not robustly prevent determined data exfiltration attacks.

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