To check which third-party apps have access to Google Workspace, you need to review OAuth permissions, user-authorized apps, domain-wide delegated access, and token activity inside the Admin Console. These logs reveal every external SaaS tool users have approved — including apps with access to email, files, calendars, contacts, and Drive data.

Many organizations use platforms like FrontierZero to consolidate these permissions across all accounts and detect apps requesting excessive or risky scopes.

Why Third-Party Access Is Hard to Track in Google Workspace

Google Workspace logs all app authorizations, but it does not unify them into one complete, admin-friendly inventory. That creates blind spots around what users are connecting.

1. Users can approve OAuth apps without admin review

Most SaaS apps allow user-level consent.
A single click can grant access to:

• Gmail
• Drive
• Calendar
• Contacts
• user identity and metadata

Admin Console logs this, but does not automatically flag high-risk apps.

2. SSO Activity only covers part of the picture

Many SaaS tools authenticate through:

• OAuth
• personal Google accounts
• API keys
• username/password

SSO logs will not show these connections.

3. OAuth tokens stay active even after disabling a user

Tokens remain valid until explicitly revoked.
They do not automatically expire when:

• the user is suspended
• the user is deleted
• the password changes
• admin roles are updated

Tools like FrontierZero identify long-lived or orphaned tokens tied to inactive users.

How to Manually Check Third-Party Access in Google Workspace (Step-by-Step)

1. Review OAuth App Access in Admin Console

Navigate to:
Admin Console → Security → API Controls → App Access Control

Review:

• apps users have granted OAuth access to
• scopes requested
• apps using sensitive or restricted permissions
• unverified apps

FrontierZero aggregates all user-level OAuth grants into one centralized view.

2. Check User-Level Connected Apps & Sites

Navigate to:
Admin Console → Users → (Select user) → Security → Connected apps & sites

Look for:

• apps with mailbox/file/calendar access
• apps with offline tokens
• apps used by only one employee
• apps showing unusual or unnecessary permissions

Most shadow IT originates here.

3. Review Domain-Wide Delegation (High-Risk Zone)

Navigate to:
Admin Console → Security → API Controls → Domain-wide delegation

These apps can act on behalf of any user in the domain.

Check for:

• broad scopes
• legacy integrations
• vendor apps no longer used
• internal project apps with excessive permissions

FrontierZero highlights these high-impact permissions automatically.

Related Sub-Questions

How do I know if a third-party app is high-risk?

Check if it requests:

• Gmail read/write
• Drive read/write
• offline access
• directory access
• sensitive or restricted scopes

FrontierZero flags apps with excessive permissions for faster evaluation.

Can employees add apps even if SSO is enforced?

Yes. OAuth and consumer Google IDs allow users to add apps without SSO enforcement. This is why continuous monitoring is needed.

Why do apps remain connected after disabling a user?

Because OAuth tokens stay active until revoked. Suspending a user does not remove authorization. FrontierZero identifies these tokens across the environment.

FAQ

Do all OAuth apps appear in Admin Console?

Yes, but user activity and risk levels are not automatically ranked.

Does Google automatically block risky apps?

No. Admins must configure access levels and domain-wide policies manually.

Can apps access data without admin approval?

Yes. User-consent OAuth apps can access data immediately unless restricted.