CISA Red Team Tests Expose Critical Gaps in Infrastructure Cybersecurity

Two critical infrastructure organizations discovered serious vulnerabilities in their cyber defenses after the Cybersecurity and Infrastructure Security Agency conducted red team assessments — with one organization failing to detect any intrusion activity until significant damage had already been done.

The findings, published by CISA on August 26, 2026, reveal a stark divide in how organizations respond to simulated cyberattacks. The results underscore an urgent reality: many critical infrastructure operators remain dangerously underprepared for the sophisticated threats targeting essential systems across the United States.

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What the Red Team Assessments Revealed

CISA used adversarial tradecraft to replicate real-world malicious activity across both organizations. The goal was to determine each organization's ability to detect, probe, and respond to threats in conditions that mirror actual attack scenarios.

Organization One: A Complete Detection Failure

The results were sobering for the first organization. CISA's red team gained initial access to several workstations without triggering a single alert from the security operations center (SOC). From there, the team escalated privileges across the domain and moved laterally to additional systems — all while remaining completely undetected.

This is precisely the scenario that keeps security leaders awake at night. When an attacker can move freely through a network — escalating privileges, pivoting between systems, and deepening their foothold — the window for meaningful containment closes rapidly. By the time detection occurs, the damage is rarely limited to a single endpoint.

Organization Two: Partial Success, Persistent Gaps

The second organization fared considerably better. When the red team gained initial access, the SOC identified the intrusion and quarantined it. The red team then shifted to an assumed breach model — a strategy that simulates an attacker already operating inside the network — and while some of that subsequent activity was also caught and contained, not all of it was neutralized.

This outcome, while meaningfully stronger than the first, still exposes a critical truth: detection is not the same as containment, and containment is not the same as full remediation. A partially effective response still leaves organizations exposed to data exfiltration, lateral movement, and prolonged attacker persistence.

The gap between these two outcomes illustrates how dramatically internal security culture, tooling, and team coordination can affect an organization's resilience against a determined attacker. Organizations that have not recently validated their defenses through structured penetration testing and adversarial simulation exercises are, in effect, operating on assumptions rather than evidence.

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The Core Lessons CISA Wants Organizations to Hear

CISA distilled the red team findings into three critical lessons that apply broadly across the critical infrastructure sector.

Detection Tools Need Constant Tuning

Without regular calibration, even sophisticated security platforms will miss genuine threats. Alert fatigue — caused by excessive false positives — dulls the responsiveness of security teams over time and creates blind spots that attackers can exploit. A SOC overwhelmed by noise is functionally less effective than one operating with fewer, higher-fidelity alerts. Tuning is not a one-time configuration task; it is an ongoing operational discipline.

Organizational Silos Are a Security Liability

Bureaucratic complexity and communication barriers between departments prevent effective and timely incident response. When teams cannot coordinate fluidly, attackers gain valuable time to deepen their foothold inside a network. The speed of an attacker's lateral movement will almost always outpace the speed of a siloed organization's response. Breaking down these barriers before an incident occurs is one of the highest-leverage investments a security leader can make.

Cloud Environments Carry Underestimated Risk

As critical infrastructure operators increasingly migrate operations to cloud platforms, many organizations have not developed sufficiently mature security postures to match that expanded attack surface. Misconfigured permissions and unmonitored access points represent serious vulnerabilities that are frequently overlooked during and after cloud migrations.

A well-coordinated attacker team with clearly defined roles and real-time communication will consistently outmaneuver a disorganized defense — regardless of how sophisticated the individual security components appear on paper. This dynamic is especially pronounced in cloud environments, where misconfigurations can silently persist for months without triggering any internal review.

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Key Actions Organizations Should Take Now

CISA outlined specific remediation steps based on the red team findings. Security leaders should treat these recommendations as immediate priorities rather than long-term planning items.

Tune Detection Tools Continuously

Establish and sustain accurate baselines that reduce false alert noise and improve genuine threat identification. Detection platforms that are not regularly calibrated against current network behavior will drift toward ineffectiveness — producing either too much noise or too many blind spots.

Break Down Internal Silos

Empower security workers with the cross-functional authority and communication channels needed to respond quickly and effectively. Incident response is a team sport. When organizational structure impedes real-time coordination, the attacker benefits directly. Building cross-departmental response structures before an incident occurs can mean the difference between rapid containment and a prolonged breach with lasting consequences.

Establish and Enforce Conditional Access Policies

Monitor consistently for unused or excessive permissions that could be exploited for lateral movement. Excessive permissions are one of the most common and most preventable vectors attackers use to escalate their access once inside a network. Conducting a thorough vulnerability assessment to identify exposed access points and misconfigured permissions should be a recurring operational task, not a one-time audit.

Implement Cloud-Specific Detection and Remediation Procedures

Design and regularly review detection and remediation procedures built specifically for cloud compromise scenarios. Generic on-premises playbooks frequently fail to account for the unique characteristics of cloud environments — including shared responsibility boundaries, ephemeral workloads, and identity-based access controls.

These steps are not aspirational best practices. They are direct responses to observed failures uncovered during live adversarial testing against real infrastructure organizations.

Why Timing Matters

The timing of this report carries significant weight. Critical infrastructure cybersecurity has been elevated to a national security priority amid escalating threats from sophisticated state-sponsored actors and criminal groups targeting energy, water, and communications systems. A CISA webinar titled Critical Infrastructure Security Is National Security — made available on August 25, 2026 — addressed related strategies for improving visibility and response across security operations.

The red team findings reinforce what many security professionals have long argued: technical tools alone cannot secure an organization. Human coordination, process discipline, and continuous testing are equally essential components of a mature security posture. For organizations that have not yet formalized this approach, conducting a comprehensive cybersecurity risk assessment to benchmark current capabilities is a practical and high-value starting point.

Three Practical Actions for Security Leaders

For security leaders reviewing these findings, three actionable priorities stand out.

First, scheduling or requesting a red team or tabletop exercise provides an honest measure of where detection and response capabilities actually stand — versus where leadership assumes they stand. Assumptions are not a security strategy.

Second, auditing cloud environments for excessive permissions and unmonitored access points should be treated as a recurring operational task rather than a one-time configuration review. Cloud environments evolve continuously, and so do their associated risks.

Third, investing in cross-departmental communication structures for incident response — before an incident occurs — can mean the difference between rapid containment and a prolonged breach with lasting consequences. The organizations best positioned to weather a sophisticated attack are those that have rehearsed their response long before it was needed.

For further reading on the broader regulatory and strategic context surrounding critical infrastructure protection, the CISA official resources and guidance library provides continuously updated frameworks, advisories, and toolkits relevant to security operations teams across all infrastructure sectors.