Author

Kristina Nikoli'c

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Preprint Nov 2026

The Devil is in the Context: Nine Dimensions of Prompt Injection Attacks

Prompt injection is usually discussed and evaluated as a single, homogeneous type of attack. However, vulnerabilities reported in real-world systems show that prompt injections vary widely. Moreover, the same instruction can be a prompt injection in one context and a legitimate request in another, depending on the user...

Jia-Min Chang, Kristina Nikolic, Rishi Sharma et al. · 0 citations

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. · arXiv.org · 2 citations