How to Remove Risky OAuth Apps from Google Workspace

OAuth apps are essential for extending Google Workspace functionality, but they can also create hidden security risks if not properly managed. Over time, third-party apps with excessive permissions or forgotten authorised access can expose your critical business data to breaches, insider threats, or compliance failures.

This guide explains how Google Workspace admins and business owners can identify risky OAuth apps, revoke unnecessary access, and implement controls that keep your environment secure without disrupting productivity.

Why Is Managing OAuth App Access Crucial for Google Workspace Security?

OAuth allows third-party apps to access Google Workspace data on behalf of users without sharing passwords. While convenient, this permission model can lead to serious security challenges if apps are authorised without oversight or later abandoned.

Apps often request broad permissions, such as reading emails, accessing Drive files, or modifying calendars, that provide attackers or careless insiders with a dangerous foothold. Even when users leave your organisation, apps they connected might retain access indefinitely unless explicitly revoked.

Failing to manage these permissions can result in:

• Data loss or leakage from compromised or abandoned apps
• Business email compromise via malicious forwarding rules
• Privilege escalation and persistent backdoors through overprivileged apps
• Breaches caused by third-party vendors or shadow IT apps

Managing OAuth apps is therefore a critical part of a comprehensive Google Workspace security strategy, helping you reduce risks and maintain data sovereignty.

How to Identify Risky OAuth Apps in Your Google Workspace

It’s really important to understand which apps have access and how much is the first step to regaining control.

Google Admin Console

The Admin Console’s Security section provides a view of third-party app access:

• Navigate to Security > Access and data control > API controls > Manage third-party app access
• Review the list of apps with OAuth permissions, including their permission scopes (OAuth scopes specify what data/apps they can access)
• Look for apps with broad or high-risk scopes such as full mailbox access, Drive modification, or admin directory permissions
• Check last authorised and usage data to identify abandoned or low-use apps

Look for Shadow Apps and Orphaned Access

Employees may install apps outside IT approval (shadow SaaS), creating hidden risks. Also, deleted or disabled users may leave app permissions active. Monitoring tools or SaaS management solutions can help detect these invisible permissions that Google’s native admin tools might miss.

Step-by-Step Guide to Removing Risky OAuth Apps from Google Workspace

1. Access the Google Admin Console

Log in with an administrator account to the Google Admin Console.

2. Review Third-Party App Access

Go to Security > Access and data control > API controls > Manage third-party app access.

3. Select the Risky App

Identify the app with risky permissions and click on it to view detailed permission scopes and user authorisations.

4. Block or Remove Access

You might find it helpful to either:

• Block the app to prevent new authorisations while not affecting current users (if needed)
• Remove or revoke access so the app can no longer access your data

5. Communicate with Users

Notify affected users about the removal to reduce confusion and avoid productivity disruptions.

6. Implement Ongoing Monitoring and Policies

Your organisation can set up policies for app approvals, periodic review of permissions, and automation where possible to prevent future unauthorised access.

How To Manage OAuth Apps

• Regular Audits: Schedule quarterly reviews of OAuth permissions and app authorisations.
• Whitelist Trusted Apps: Maintain an approved list of apps with necessary permissions to limit exposure.
• Set Scoped Access: Limit OAuth scopes to the minimum necessary for app functionality.
• Use Approval Workflows: Require employees to request app access through IT or Security teams.
• Automate Risk Detection: Employ SaaS security tools that detect risky or abandoned OAuth apps automatically.
• Educate Users: Ensure your users understand the risks of blindly authorising third-party apps.
• Enforce Least Privilege: Remove unused or overprivileged apps promptly, especially when users leave.
• Leverage Native Google Controls: Use Google Workspace’s API access controls and context-aware access settings.

What to Do If You Find Malicious or Unknown OAuth Apps?

If you detect an app that looks suspicious or was never approved:

• Immediately revoke its permissions in the Admin Console.
• Investigate which users authorised it and assess potential data exposure.
• Report the app to Google or security platforms for risk scoring and further analysis.
• Review your connected apps regularly to identify and eliminate such surprise access points.

Protect Your Workflow and Data with BackupVault

Beyond managing OAuth app risks, backing up your Google Workspace data is vital to recover quickly from accidental deletion, ransomware, or malicious app actions. BackupVault offers fully automated, encrypted cloud backups hosted in UK data centres with 24/7 support. Our solution ensures your email, Drive, Calendar, and contacts are safely stored and can be restored within minutes.

Secure your Google Workspace environment comprehensively by considering Google Workspace backup. You might find that using BackupVault improves your organisation’s resilience to data risks.