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importantSYS.SOURCE: arXiv• 2026-07-10T21:03:38Z

Prismata: A Defense Against Cross-Site Prompt Injection in Web Agents

#Web Security#Prompt Injection#Privacy Protection#Machine Learning Security#Cybersecurity

Prismata introduces a contextual least-privilege framework to confine cross-site prompt injection attacks in web agents through dynamic trust derivation and mechanical content confinement. The system reduces attack success rates while maintaining benign task utility without requiring developer annotations.

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