Generative AI Security — The 2026 CISO Guide
Guide · 2026-04-04 · 13 min read · FilterPrompt Security Team
How to secure generative AI end-to-end — model, prompts, tools, data, and supply chain — with the vendors and frameworks that matter in 2026.
Generative AI is the fastest-adopted enterprise technology in history — and the fastest-attacked. CISOs searching for 'generative ai security', 'gen ai security', or 'genai security' typically want the same thing: a defensible answer to 'how do we protect our GenAI features?' that they can present to a board or auditor. This guide gives you that answer.
The 4 controls every GenAI program needs
- AI firewall — inline prompt/response inspection with blocking.
- AI vulnerability scanner — offline adversarial probes on every model change.
- AI governance — inventory of models/prompts, policy, compliance mapping.
- Human review — approval workflows for high-risk agent actions.
Framework alignment
Threat model — what attackers actually do
- Extract system prompts to understand model constraints.
- Inject instructions via user input or indirect channels.
- Poison RAG stores with instructions inside retrievable docs.
- Trigger unauthorized tool calls via agent injection.
- Exfiltrate PII, secrets, or proprietary training data.
- Cause model DoS with expensive generations.
Reference architecture
App → Firewall → Model → Firewall → App, with all traffic mirrored to a governance store. Scanner runs on a schedule against the model endpoint. High-risk agent actions route through a human-approval queue. This architecture is provider-agnostic — works with OpenAI, Anthropic, Bedrock, Vertex, or self-hosted.
Budget benchmark
In 2026, mature GenAI programs spend 3–5% of AI infrastructure budget on GenAI security controls. Below 2%, breaches become inevitable; above 8%, spend is inefficient and better redirected to governance headcount.
Vendor landscape 2026
The 90-day rollout plan
- Days 1–14: Inventory every GenAI feature in the company ('shadow AI' scan).
- Days 15–30: Baseline scan against OWASP LLM Top 10 with FilterPrompt Scanner.
- Days 31–60: Deploy AI firewall on top-3 highest-risk endpoints.
- Days 61–90: Add governance + human-review workflows; establish monthly scan cadence.
