Prompt Injection Defense Weekly

Spotlighting: the one-line system prompt trick that stops indirect injection at the source

Indirect prompt injection is live in the wild — Google and Forcepoint confirmed 32% growth in malicious payloads on real websites by early 2026. This week's defense: Microsoft Spotlighting, a prompt-level isolation technique you can ship in five minutes. Includes three drop-in system prompt templates (minimal, OWASP-recommended, and layered), plus a four-case test harness to verify before deploying.