prompt injection

Prompt injection is a security vulnerability where an attacker manipulates an AI system by embedding malicious instructions within seemingly benign input, tricking the model into ignoring its safety guardrails or revealing sensitive data. On WindowsForum.com, discussions highlight how prompt injection affects enterprise AI assistants like Microsoft 365 Copilot, as demonstrated by the SearchLeak vulnerability chain patched in June 2026. This attack vector blurs the line between phishing, data exfiltration, and traditional prompt injection, especially as agentic AI systems gain tool-use capabilities and privileged access to corporate data. The tag covers real-world risks, mitigation strategies, and the evolving security model needed as AI moves from answering questions to taking actions on behalf of users.