By
Jonathan Pierce
Research Fellow, Industrial Operations Security
February 11, 2026
When executives and policymakers discuss threats to critical infrastructure, the focus typically falls on external actors — foreign adversaries, ransomware groups, and sophisticated nation-state operators. This framing is understandable, but it is incomplete. Some of the most consequential security failures in critical infrastructure environments have originated from within the organizations themselves, from employees, contractors, and trusted vendors with legitimate access to sensitive systems.
The insider threat problem is not primarily a technology problem. It is a governance, culture, and access management problem that requires executive-level ownership.
Understanding the Risk Spectrum
Insider threats exist across a spectrum. At one end is the malicious actor — an employee or contractor who deliberately exploits access for financial gain, ideological motivation, or at the direction of a foreign intelligence service. At the other end is the negligent insider, an otherwise well-intentioned individual whose actions, whether clicking a malicious link, misconfiguring a system, or bypassing a security control for operational convenience, create exploitable vulnerabilities.
Both categories present serious risk to critical infrastructure operations. The negligent insider is statistically more common. The malicious insider is potentially more damaging. Neither is adequately addressed by perimeter-focused security strategies.
Why Critical Infrastructure Is Particularly Exposed
Operational environments in energy, water, transportation, and industrial manufacturing present specific conditions that amplify insider risk. Many facilities rely on long-tenured contractors and third-party service providers who maintain deep system access over years or decades. Personnel changes, financial pressures, and workforce dissatisfaction — factors that increase insider risk across any organization — are present in these environments as they are everywhere else.
Access control in operational technology environments is frequently less rigorous than in enterprise IT settings. Shared credentials, infrequently audited permissions, and legacy systems without modern authentication capabilities create conditions where inappropriate access may go undetected for extended periods.
What Leadership Must Address
Organizations operating critical infrastructure should evaluate whether their insider threat programs match the sensitivity of the environments they are protecting. This means conducting regular access reviews to ensure permissions align with current roles and responsibilities. It means establishing clear behavioral monitoring policies that balance employee privacy with operational security requirements. And it means creating organizational conditions where personnel feel empowered to report concerns without fear of retaliation.
Third-party and contractor access deserves particular scrutiny. Vendors with remote access to control systems represent a trusted but incompletely controlled entry point, and their access should be governed with the same discipline applied to internal personnel.
The insider threat will never be fully eliminated. But organizations that treat it as a managed risk — with defined policies, accountable leadership, and regular review — will be substantially more resilient than those that address it only after an incident has occurred.
