6 Signs Your Organization Is Overdue for a Zero Trust Overhaul

What do your security controls protect, really?

What could an attacker reach in your organization through one compromised account? Could your team quickly tell you who accessed a sensitive system in the past 30 days? Does every application use the same identity and authentication controls?

The answers tell you more about your security posture than the age of your technology or how much you’ve invested in it. An organization can have modern tools and still rely on broad trust, excessive access, and inconsistent controls.

I’ve spent more than two decades building security programs, from founding an organization’s first security operations center to standing up enterprise identity platforms and moving thousands of systems to the cloud for banks and other regulated businesses. Across that work, I’ve repeatedly seen a gap between what leaders believe their security controls will prevent and what an attacker could do once they test them.

Zero Trust is designed to close that gap. It treats no user, device, or connection as trustworthy by default. Every request to reach data or systems has to prove who or what is making it and that the access is authorized. The old castle-and-moat model trusted anything inside the network. Zero Trust assumes that being inside isn’t enough.

The consequences can be expensive. The average U.S. breach reached a record $11.5 million in IBM’s 2026 Cost of a Data Breach Report, and one in four malicious breaches in that study were AI-enabled.

None of these conditions requires a forensic audit to spot; one candid conversation with your security team will surface most of them.

1. Your Network Perimeter Is Still Your Primary Line of Defense

What it looks like. “Secure” means behind the firewall and the VPN. Once a user or device is on the corporate network, it’s broadly trusted.

Why it matters. Attackers don’t have to defeat the perimeter to create significant damage. They may enter through stolen credentials, an unpatched vulnerability, a third party, or another compromised system. If reaching the corporate network gives them broad access, that initial compromise becomes much more consequential.

The move. Treat network location as one signal rather than proof of trust. Access should depend on verified identity, device health, context, and the specific resource being requested.

2. One Compromised Account or System Could Reach Too Much

What it looks like. The environment is flat. Internal boundaries are few, standing privileges are broad, and administrative access is spread far wider than anyone can readily explain.

Why it matters. Initial access is only the beginning. The 2026 Verizon Data Breach Investigations Report shows credential abuse appearing in 39 percent of breaches. Once attackers obtain credentials, excessive privileges and a flat network give them room to move through the environment. That’s how one compromised account can turn a limited intrusion into an enterprise-wide incident.

The move. Adopt least-privilege access and micro-segmentation so compromising one account or system doesn’t compromise everything.

When I founded an organization’s first security operations and incident response function, we pulled the thread on nearly every major incident and kept finding the same root cause: one set of credentials, a flat network, and standing privileges that hadn’t been revisited in years. Segmentation, least privilege, and real monitoring cut our downtime from serious incidents by roughly 90 percent.

3. Identity Is Fragmented and Multi-Factor Authentication Is Inconsistent

What it looks like. There’s no single, authoritative view of identity. MFA covers some systems and skips others. Legacy applications stay exempt “for now,” and credentials used by applications, integrations, automation tools, and AI agents aren’t consistently tracked and managed.

Why it matters. Identity is where a modern enterprise draws its boundaries, and attackers go looking for the gaps. Each exempted system weakens the controls on all the others. Applications, integrations, automation tools, and AI agents also need credentials and permissions to access company systems. If those aren’t governed with the same care as employee access, they create another path to sensitive systems and data. IBM reported that only 46 percent of breached organizations secured non-human identities in their AI workflows, and 92 percent of those with an AI-related breach lacked proper AI access controls.

The move. Consolidate to a single identity provider, enforce phishing-resistant MFA everywhere, and consistently manage the credentials and permissions that applications, integrations, and AI agents use.

The exemption I see most often is the aging, internally built application everyone considers too fragile to touch. At one large asset manager, we brought more than 100 of those applications under the same identity platform. In the next regulatory audit, identity and access findings fell from 30 to three.

4. You Can’t Quickly Answer “Who Accessed What, and When”

What it looks like. When asked to reconstruct access to a sensitive system over the past 30 days, your team can’t do it quickly or confidently. Logging is partial, spread across separate systems, or rarely reviewed.

Why it matters. You can’t contain an incident if you can’t see what an attacker touched, and you can’t make a sound call on its seriousness without understanding its scope. Speed pays: organizations extensively using AI and automation in security operations cut breach costs by almost $2 million on average, according to IBM.

For public companies, visibility also has a regulatory edge. SEC rules require a company to determine without unreasonable delay whether a cybersecurity incident is material, then disclose a material incident on Form 8-K within four business days of that determination. That clock assumes you already know what happened.

The move. Put continuous logging and monitoring on identity and access and rehearse reconstructing an incident before you have to do it under pressure.

5. Your People and Data Have Moved to the Cloud, but Your Controls Haven’t

What it looks like. The workforce is hybrid or remote and data lives across a growing sprawl of SaaS applications. Employees, contractors, partners, and automated systems reach company resources from outside the corporate network. The security architecture still assumes a managed laptop sitting inside it.

Why it matters. Cloud adoption changed where access happens. A security model built around network location can’t consistently evaluate users, devices, applications, and data that may never touch the corporate network.

The move. Apply consistent, identity-based access policies across every device, location, application, and third party, including the personal and contractor devices your current controls can’t see.

I learned this deploying a cloud access security broker across 40,000 endpoints in 29 countries. The day that project went live, it was obvious the perimeter I’d spent years hardening had no clear edge anymore. Our people, applications, and data were everywhere at once.

6. Security Depends on Periodic Reviews Instead of Continuous Verification

What it looks like. Access is granted at onboarding and rarely revisited. Quarterly access reviews are the main control, offboarding varies by system, and dormant accounts linger for months.

Why it matters. A user’s authorization can change long before the next scheduled review, and so can the risk attached to a device, location, or behavior. Zero Trust evaluates each request at the moment it’s made, using current conditions. A model built on periodic cleanup is out of date between reviews by design.

The move. Shift to continuous, risk-based verification, and automate deprovisioning the moment access is no longer warranted.

You don’t have to rip everything out

Leaders often picture Zero Trust as one disruptive, all-or-nothing program. The organizations that succeed run it in phases. Start with identity: unify it and enforce strong authentication. Then reduce standing privilege, segment the network, and extend continuous monitoring across the environment. Each phase reduces risk on its own, so the business sees value long before the last phase is done.

Even organizations that have started implementing Zero Trust rarely cover everything at once. Gartner found that 63 percent of organizations had fully or partially implemented a Zero Trust strategy, but for most, that strategy covered half or less of the organization’s environment. The work moves forward one funded, sequenced step at a time.

I’ve sat in the rooms where that funding gets decided, including making the case to the board of a highly regulated bank to commit to a cloud-first architecture. Threat data alone rarely moved the conversation. A credible dollar figure tied to the business did, as did a clear understanding of the regulatory exposure. The case for Zero Trust needs to connect the security risk to the business risk and show what each phase of the investment will address.

How Resultant can help

Knowing where your security model falls short is only the beginning. Resultant helps organizations assess their current security posture, identify where their controls create the most risk, and build a phased Zero Trust roadmap they can execute without disrupting operations.

I’ve worked this problem from both sides, building and running internal security programs and advising organizations as a virtual CISO.

If these signs describe your environment, let’s talk while you still get to set the terms.