arXiv:2609.30657v1 Announce Type: new Abstract: Large language model email assistants are particularly vulnerable to indirect prompt injection because untrusted email content can be retrieved into the model context and influence subsequent tool use. Existing prompt injection detectors mainly formulate this problem as binary malicious text classification, which overlooks the important factor that harmful agent behavior often arises through a sequence of stages.
Prompt Injection Detection for Email Agents Through Attack Chain Modeling
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