Prompt injection
Definition
Prompt injection is an attack in which malicious instructions are hidden in text, documents or web pages that an AI model reads, causing it to ignore its intended instructions, leak data or take unwanted actions.
Why It Matters
It is the leading security risk for AI agents that read untrusted content and can act on a user's behalf.
Latest Coverage
- Microsoft Digital Defense Report 2026 finds threat actors embedding AI across the attack chain 3 October 2026
More in Cybersecurity and AI Threats.
Related Terms
- Known Exploited Vulnerabilities (KEV) catalog
- Zero-day vulnerability
- Ransomware
- CVE
- Software supply chain attack
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