Article Summary: A SaaS offboarding security audit helps organizations identify and remove lingering access after employees leave. While email accounts are usually disabled quickly, zombie SaaS accounts, inactive sessions, and forgotten permissions often remain active across multiple tools. These orphaned SaaS accounts security risks can expose sensitive data long after offboarding. A structured SaaS offboarding checklist closes these gaps before they turn into a security incident.
Someone leaves the company on a Friday. By Monday, their email account is disabled, and their laptop is back in the pile.
What nobody checks is their login to the project management tool they signed up for in Q3, the cloud storage folder they shared with a contractor, or the CRM access they still have from two roles ago.
Three months later, those sessions are still active.
This is how zombie accounts form. nNot through negligence, but through an offboarding process built around corporate IT assets that no longer reflects how people actually use software.
The average company now runs more than 100 SaaS applications. Most offboarding checklists were written when there were three.
A zombie account is an active login that belongs to someone who no longer works for you. The name is informal. The risk is not.
What makes zombie accounts particularly dangerous is that they are valid credentials.
There is nothing to detect. The access was granted intentionally, and the system has no reason to question it. If a former employee walks back in through that door, or if their credentials are compromised after they leave, the access is there waiting.
Industry research finds that 50% of organizations have discovered former employees still accessing SaaS applications months after their departure date.
For most of those organizations, the discovery was accidental rather than the result of a deliberate audit.
Google Drive, OneDrive, and Dropbox are where zombie access causes the most immediate damage.
These platforms are where offboarding gets messy. Files may be shared with a departing employee’s personal account. Guest permissions granted during a project may never get cleaned up. And folders set to “anyone with the link” access may still be bookmarked.
The departure triggers a license removal in the identity provider. The shared folders, external links, and personal-account shares go untouched.
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Tools like Asana, Monday.com, Notion, Jira, HubSpot, and Salesforce are frequently provisioned by team leads rather than IT. That means the offboarding checklist has no visibility into them.
A former account executive’s Salesforce login, or a project manager’s Notion workspace with access to company strategy documents, can persist for months without anyone noticing
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This is the most dangerous category.
These are the tools employees signed up for using their work email. A survey platform. An AI writing assistant. A data visualisation tool. They were never formally provisioned, and they were never formally revoked.
When the employee leaves, the account does not get disabled. It sits there, attached to a work email address that may now redirect to an IT catch-all.
Strengthening identity visibility through Microsoft 365 Support and endpoint monitoring helps reduce this blind spot.
Start by pulling a list of all SaaS applications connected to your identity provider: Microsoft Entra ID, Google Workspace Admin, or Okta, if you use one.
Cross-reference with billing records, browser extension installs, and email domains showing regular login notifications.
Grip Security’s 2025 SaaS Security Risks Report, analyzing 29 million user accounts, identified 23,987 distinct SaaS applications in use across its customer base. That’s far more than any IT team tracks manually.
Of those applications, 90% remained outside IT’s management.
For smaller teams without a dedicated identity platform, a 30-minute review of active subscriptions and recent login notifications will surface most of the high-risk tools.
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Take the last 12 months of departures and check each name against the SaaS inventory.
For each application, ask:
Access that is months old and belongs to someone who has left is a zombie. Flag it for immediate revocation. Document what you find.
Remove the access. Record what was found and when. Then use the audit as the baseline for an offboarding checklist that covers more than the corporate email and laptop.
Going forward, enforce multi-factor authentication on all remaining active accounts and schedule a SaaS access review every quarter.
That cadence turns a one-time cleanup into a repeatable control.
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Zombie accounts cannot be removed if no one is looking for them. The SaaS offboarding audit is the starting point.
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A zombie account belongs to someone who has actively left the organization, meaning there is no legitimate reason for the access to continue. An inactive account may belong to a current employee who simply does not log in often. Both carry risk, but zombie accounts carry the additional exposure of belonging to someone entirely outside the business.
Start with your identity provider. Microsoft Entra ID, Google Workspace Admin, and Okta all allow you to filter active users and connected applications by account status. Cross-referencing those lists against HR’s exit records from the past 12 months will surface most of the obvious gaps within a few hours.
Yes, and they are harder to clean up because the original access is difficult to attribute to a single person. As a general rule, shared logins should be replaced with individual accounts wherever a SaaS platform allows it, both for the audit trail and for clean offboarding.
Quarterly is a reasonable baseline for most businesses. Any employee exit should also trigger an immediate SaaS access review as part of the offboarding checklist, rather than waiting for the next scheduled audit.
Disclaimer: This blog post is for informational purposes only and does not constitute legal, financial, or IT advice. For professional guidance tailored to your business, consult with Cascade IT Services or a certified Microsoft partner.
Article used with permission from The Technology Press.
