This guide outlines a practical roadmap for a new CISO to establish credibility, reduce risk, and align security with business objectives during the first 90 days. It emphasizes starting with deep understanding of business risk, operations, legal obligations, and stakeholder priorities before focusing on technology. The guide then moves through building the right team, clarifying processes, and developing a security strategy grounded in automation, risk quantification, and alignment with development and IT workflows. It recommends consolidating controls with modern platforms such as XDR, selectively outsourcing via MDR, and moving security earlier in the development lifecycle to reduce cost and improve resilience. Later steps focus on execution through agile methods, measurement and report

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