Originally published on — we will map the threat model, middleware design, and security review gates for your stack.
Prompt injection and LLM security for SaaS
- ▸ Prompt injection and LLM security for SaaS
- ▸ What prompt injection is (in your product)
- ▸ Why stronger system prompts fail
- ▸ Threat model for multi-tenant SaaS
- ↳ Request flow through LLM middleware
- ▸ Defense in depth: what actually works
- ↳ 1. Server-side middleware — always
- ↳ 2. Separate trusted structure from untrusted content
- ↳ 3. Enforce permissions at fetch time — not in the prompt
- ↳ 4. Design a narrow tool surface
- ↳ 5. Gate destructive and sensitive actions
- ↳ 6. Validate outputs before they leave your system
- ↳ 7. Rate limit and monitor abuse
- ↳ 8. Audit log like any privileged API
- ▸ SaaS scenarios worth testing
- ▸ RAG-specific risks
- ▸ Agent-specific risks
- ▸ What you can and cannot promise
- ▸ Production readiness checklist
- ▸ Security review checklist before GA
- ▸ How 475 Cumulus approaches security on integrations
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