Severity: HighResearchData exfiltration
LLM prompt injection enables unauthorized data exfiltration via web-fetch capability
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A researcher demonstrated a prompt injection attack against Claude that exploits the web-fetch capability to exfiltrate sensitive user data. The attack manipulates the LLM into retrieving and transmitting private information through social engineering of the model's behavior.
What to do
Enforce strict input validation and output filtering on all LLM interactions that have access to sensitive data or external APIs.
Mapped framework pillars
Sources
#prompt injection#LLM security#data exfiltration#Claude#web API abuse#social engineering