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Author

Javier Rando

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Jul 2026

Untrusted Content Masking for Web Agents with Security Guarantees

This paper presents Untrusted Content Masking (UCM), a simple and effective approach that restores the trust boundary in web environments by leveraging a key structural insight: a webpage's Document Object Model encodes sufficient information to distinguish trusted from untrusted regions without reading their content.

Kristina Nikoli'c, Egor Zverev, Javier Rando et al. · 2 citations

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