How should security teams reduce the risk created by application-specific passwords in Google Workspace?

Why application-specific passwords become a control problem

Application-specific passwords in Google Workspace are usually introduced to bridge older clients or scripts that cannot use modern authentication. That convenience comes with a governance cost: they are long-lived secrets, harder to bind to strong user assurance, and easy to overlook during offboarding or account review. Security teams should treat them as a temporary compatibility measure, not a steady-state access pattern. This is why identity and access policies need to distinguish between modern sign-in and legacy exception handling, rather than folding both into the same review process.

For teams managing a mixed estate, the main risk is not the password itself but the way it bypasses the stronger controls that modern authentication enables. Legacy access can survive after the application has been replaced, after an account changes role, or after a user leaves. Google’s own guidance on reducing legacy access is a useful starting point, but the practical answer is usually to remove the dependency entirely and keep exceptions tightly governed.

In practice, many teams discover app passwords only after a dormant account, unsupported client, or forgotten integration has already made them part of the access baseline.

How to reduce dependence without breaking older workflows

The cleanest control strategy is to inventory every use of application-specific passwords, group them by purpose, and decide whether each case can move to OAuth, service-based integration, or another supported authentication flow. That matters because the right remediation is different for a human user, a reporting tool, and a batch process. Where legacy access is still necessary, the team should define it as an exception with a named owner, an expiry date, and a documented reason for continuing to use it.

A practical rollout usually starts with the highest-risk accounts first: admins, users with access to sensitive data, and accounts that have not been reviewed recently. From there, teams can remove Less Secure App Access where possible, block new app password creation if the tenancy still allows it, and verify that any remaining exceptions are visible in identity governance or ticketing records. It also helps to align mail, file, and automation owners so that each service has a migration path instead of a permanent waiver.

• Replace app-password-dependent clients with OAuth-capable versions whenever the vendor supports it.
• Map each remaining password to a business owner, an application, and a review date.
• Revoke credentials that are no longer tied to an active process or support need.
• Check whether the account also has elevated privileges, because legacy authentication plus privilege increases exposure.

Google Workspace is the primary platform here, but the same logic applies to any environment where a legacy secret is being used to preserve compatibility rather than to satisfy a current security requirement. The guidance breaks down when organisations lack ownership of the affected application, because technical migration is then blocked by procurement, vendor support, or operational dependency.

Where exceptions, ageing accounts, and third-party tools create the sharpest edge

Tighter legacy-authentication controls often increase migration overhead, so organisations need to balance reduced exposure against the cost of replacing older integrations. That trade-off becomes sharper for third-party tools, shared service accounts, and reporting jobs that were never designed for interactive sign-in.

One common edge case is a “temporary” app password that survives because no one owns the integration any more. Another is a shared mailbox or automation account where the credential is copied into multiple places, making revocation harder and increasing the blast radius if the secret is exposed. In those cases, the control issue is not only authentication strength but also discoverability: if a team cannot tell where the password is used, it cannot retire it safely. The most defensible approach is to treat unknown usage as a migration blocker and pause the exception until the dependency is identified.

There is also a governance distinction between a tolerated legacy dependency and a control failure. When the application still requires an app password, the risk is managed by review, scope reduction, and fast retirement planning. When the same password remains active without a named owner or renewal date, the exception has effectively become an unmanaged access path.

Practitioner Guidance

What to prioritise: Remove app passwords from privileged and high-value accounts first, because those exceptions create the most consequential residual exposure. If a legacy password is tied to admin access, sensitive mail, or automation with broad data reach, treat migration as a higher-priority remediation than convenience-driven upgrades elsewhere.

What to verify: Confirm that every remaining app password has a current owner, a specific use case, and a defined retirement trigger. Teams often assume “still in use” means “still needed,” but in practice the real test is whether the dependency can be replaced without breaking business function.

Common mistake: Leaving legacy passwords in place after the application has already been modernised. The credential then becomes an invisible backdoor to the old access path, especially if no one has revisited the exception since the original workaround was created.

Practitioner takeaway: The safest program is not one that merely rotates app passwords faster, but one that steadily shrinks the number of places where they exist at all.

Related resources from NHI Mgmt Group

• How should security teams reduce consent phishing risk in Microsoft 365 and Google Workspace environments?
• How should security teams reduce the risk of Google Ad Manager account takeover?
• How should security teams reduce cloud identity risk when passwords and credentials are still widely shared?
• How should security teams use runtime blocking to reduce application exploit risk?