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Security, CISO, Governance, AI Risk

The 90-Day AI Security Playbook for CISOs

Tam Gregersen

• 2 min read
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The 90-Day AI Security Playbook for CISOs

AI isn't waiting for your security program. It's already in your environment.

Zscaler's analysis of enterprise AI traffic found an 83% year-over-year increase in AI usage — with more than 18,000 terabytes of enterprise data moving through AI applications in a single year. In red team engagements across 25+ enterprise environments, researchers found critical vulnerabilities in 100% of AI systems tested. Median time to first failure: 16 minutes.

In most organizations, employees are already using copilots, embedded AI in SaaS tools, and early agentic workflows — often before security has a clean inventory, a review process, or a control baseline.

This isn't a technology problem. It's an operating model problem. And this playbook is how CISOs catch up — fast.

The 90-Day AI Security Playbook is not a comprehensive theory of AI security. It's a practical baseline plan grounded in current guidance from NIST, CISA, and OWASP — built around nine moves that establish the structure security teams need right now:

  • Move 1: Inventory AI use before you try to secure it — including the embedded AI your vendors shipped without telling you
  • Move 2: Classify use cases by risk tier — because not all AI carries the same exposure
  • Move 3: Establish approved tools and safe lanes — so governance has a path, not just a wall
  • Move 4: Update policies before you enforce controls — or they won't hold
  • Move 5: Lock down data exposure — including the approved tools generating millions of DLP violations
  • Move 6: Secure high-risk integrations and agents — workflows are riskier than models
  • Move 7: Test and red team where it matters — monitoring is not the same as testing
  • Move 8: Define real human oversight — a human clicking "approve" without reviewing isn't oversight, it's liability
  • Move 9: Secure the data and model supply chain — attackers need to corrupt only 0.001% of training data to embed a backdoor

Plus: a 30/60/90-day operating calendar, board-ready metrics for demonstrating due professional care, a CISO quick start checklist, a RACI chart, and a fast red teaming checklist.

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