The CISO gap is the shortage or complete absence of dedicated security leadership inside an organization. It usually means there is no experienced person owning security policy, risk decisions, incident readiness, and vendor oversight. In small and mid-sized businesses, this gap is often filled by a managed security service provider or a fractional security leader, but the responsibility for risk still stays with the business.
This matters because cyber security is not only a tooling problem. Without strong leadership, organizations often have weak identity controls, unclear escalation paths, and poor approval for exceptions or third-party access. Attackers benefit from that confusion: phishing, account takeover, and abuse of over-privileged admin accounts are harder to contain when no one clearly owns the response. Defensively, closing the CISO gap means assigning accountability, tightening access, improving logging, and making sure any external provider has explicit boundaries and oversight.