The Hidden Cybersecurity Risks of Former Employee Access

When an employee leaves your organization, there's usually a process. Their final paycheck is issued. Company equipment is returned. HR completes the necessary paperwork. Their replacement may already be getting settled into the role. But what happens to their digital access?Their email account might be disabled, but what about the cloud applications they used?

The shared passwords they knew? The remote access permissions they were granted? Or the third-party platforms nobody remembers they had access to? These are the kinds of details that can quietly create cybersecurity risks long after an employee's last day. And during Cybersecurity Awareness Month, they're worth taking a closer look at.

An Employee Can Leave Without Their Access Leaving With Them

Most organizations understand the importance of disabling an employee's primary network and email accounts when they leave. But today's workplace is far more connected than it was even a few years ago. Employees routinely access multiple systems to do their jobs. Some are managed directly by IT, while others may be purchased or administered by individual departments.

Think about how many platforms a typical employee might use:

- Microsoft 365 or Google Workspace
- Customer relationship management (CRM) software
- Cloud storage and file-sharing platforms
- Financial and accounting applications
- Remote access tools and VPNs
- Project management software
- Vendor portals and third-party applications
- Shared administrative accounts

Now consider how many of those systems are included in your organization's formal employee offboarding process. Disabling one account doesn't necessarily mean you've removed every way someone can access your business.

The Forgotten Accounts Nobody Thinks About

One of the more overlooked cybersecurity challenges is simply knowing where employees have access. Imagine an employee who worked in your accounting department for seven years. During that time, they were given access to several financial applications, a vendor payment portal, shared folders and a cloud-based reporting platform. When they leave, IT disables their company email and network credentials. Everything seems handled. Except the employee's login to the vendor portal was created independently of the company's central identity management system.

Their access to a financial reporting platform is still active, too. Months later, those credentials still exist. The concern isn't necessarily that the former employee intends to use them. It's that every unnecessary active account represents another potential opportunity for unauthorized access. If credentials are stolen, reused or compromised, those forgotten accounts can become a security weakness.

Shared Passwords Create a Different Problem

Not every application uses individual employee accounts. Some organizations still rely on shared credentials for vendor portals, administrative systems, equipment management or other business applications. When an employee who knew those passwords leaves, disabling their personal accounts won't eliminate that knowledge. This becomes especially concerning when shared credentials provide elevated privileges or access to sensitive information.

A proper offboarding process should account for shared credentials, including rotating passwords where necessary and reviewing who has access. Ideally, organizations should move toward individually assigned accounts, role-based permissions and secure credential management whenever possible. After all, if five people share the same login, how do you confidently know who accessed the system?

What About the Devices and Data Employees Take With Them?

Employee offboarding isn't limited to usernames and passwords. Consider an employee who regularly worked remotely using a personal laptop. They may have downloaded documents, synchronized company files or accessed sensitive information through applications installed on their device. Even after their company accounts are disabled, locally stored information may remain. Organizations should understand where business information is stored, which devices are authorized to access it and what controls exist to protect it.

This is particularly important for businesses with hybrid and remote workforces. A well-designed offboarding process should address company-owned devices, personal devices used for business, application sessions, file synchronization and data retention requirements. The goal isn't to make an employee's departure unnecessarily complicated. It's to protect company information while respecting employee privacy and applicable policies.

The Cybersecurity Risk Doesn't Always Come From the Former Employee

When discussing former employee access, it's easy to imagine a disgruntled employee intentionally causing damage. While insider threats are a legitimate concern, they aren't the only reason to take offboarding seriously. An inactive but accessible account can be targeted by cybercriminals. Credentials may have been exposed in a previous data breach. A forgotten account might lack MFA or continue to have permissions that are no longer appropriate.

In some situations, attackers may exploit accounts that receive little attention because the employee is no longer actively using them. This is why employee offboarding should be viewed as part of an organization's broader identity and access management strategy, not simply an administrative task. An account doesn't have to be actively used to create risk.

Who Actually Owns the Offboarding Process?

Here's where things can get complicated.

HR knows when an employee is leaving.

IT manages many of the accounts and devices.

Department managers know which specialized applications the employee used.

Outside technology providers may manage additional systems.

But is everyone communicating?

If HR assumes IT knows about an employee's departure, and IT assumes the department manager has already requested access removal, important steps can fall through the cracks. An effective offboarding process requires coordination. There should be a clearly defined procedure that identifies who initiates the process, who removes access, which systems need to be reviewed and how completion is verified. For employees with privileged access, additional precautions may be appropriate. The process should also account for the timing of access removal, particularly in situations involving sensitive roles or involuntary departures.

Five Questions to Ask Your IT Team This Cybersecurity Awareness Month

You don't need to wait for a security incident to evaluate your employee offboarding process.

Start with a few straightforward questions:

1. Do we have a complete inventory of the applications our employees can access?

If your organization doesn't know which systems employees use, it becomes difficult to ensure their access is removed.

2. Are all employee accounts disabled or removed when someone leaves?

This includes cloud applications, third-party platforms, remote access tools and accounts that aren't managed through a central directory.

3. What happens to shared passwords and administrative credentials?

Consider whether credentials need to be rotated and whether privileged permissions have been appropriately revoked.

4. Do we verify that access has actually been removed?

A completed checklist is helpful, but verification provides greater confidence that the necessary actions occurred.

5. When was the last time we reviewed inactive accounts?

Periodic access reviews can help identify accounts belonging to former employees, unused service accounts and permissions that are no longer necessary. These questions may seem simple, but the answers can reveal important gaps.

Cybersecurity Awareness Month Is a Good Time to Look Back

Most cybersecurity conversations focus on what comes next. The latest threats. New security tools. Emerging vulnerabilities. The next generation of attacks. But sometimes, improving cybersecurity means looking backward. Think about the employees who left your organization over the past year. The applications your business stopped using.

The vendors you no longer work with. The temporary permissions that were never removed. Are you confident all that access has been addressed? Cybersecurity Awareness Month is an opportunity to examine the everyday processes that contribute to a stronger security posture. And employee offboarding is one of them.

Get Cyber Smarter With Total Communications

At Total Communications, we understand that cybersecurity isn't just about protecting networks from outside threats. It's also about understanding who has access to your systems, how that access is managed and where potential vulnerabilities may exist. Through our managed IT and cybersecurity solutions, we help organizations strengthen their security environments with services such as endpoint protection, vulnerability management, monitoring, security awareness training and strategic technology planning. Whether you're reviewing your employee offboarding procedures or taking a broader look at your cybersecurity strategy, having the right processes and protections in place can make a meaningful difference.