AI summary subject prompt injection — directive language in the Subject line ("ignore previous instructions", "you are now", "system:") to poison Apple Intelligence / Gmail AI / Outlook Copilot inbox summaries
ai-summary-subject-prompt-injection
What this tier means
High-confidence threat indicator — phishing, impersonation, BEC, or scam pattern. Strong contributor to the trash decision.
How Gorganizer detects this
The Subject line contains AI-directive phrases that target inbox-list summarizers in Apple Intelligence (iOS 18+), Gmail's built-in AI summarizer, and Microsoft Outlook Copilot. These summarizers stitch Subject + From + snippet together before feeding the prompt to the LLM — if the Subject contains directives like "ignore previous instructions", "you are now", "system:", "disregard the above", the summary renders the attacker's chosen text directly in the inbox list, granting authority the real email body lacks. Distinct from body-level prompt-injection signals (`ai-assistant-indirect-prompt-injection-exfil`, `llm-prompt-injection-plaintext`, `ai-agent-prompt-injection-lure`) because the Subject is the field AI summarizers read FIRST and most prominently, and because hidden-styling tricks that hide body text don't apply to the Subject header. Legitimate emails never contain prompt-injection directives in the subject — this is a nearly-zero-false-positive indicator.
False-positive guard
Every signal in Gorganizer feeds a multi-module score — never a sole verdict. This is a threat-tier signal — it adds a strong contribution to the trash score. The full pipeline still requires convergence across multiple modules + a margin over the safety floor before deletion happens, and Gmail's trash (30-day recovery) is always used — never permanent delete.
About the scoring engine
Gorganizer's scoring engine emits 2,143+ signals across six modules — headers, sender, subject, body, attachments, and structural metadata. Every email is scored by every module independently; the final verdict requires multiple modules to agree and the trash score to beat the safety floor by a margin.
Sacred safety guards — never delete starred emails, replies, calendar invites, receipts/invoices, or attachments — apply unconditionally regardless of any signal.
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