Topic starter
04/06/2026 6:50 pm
TL;DR: Google’s exact-match redirect URI requirement creates operational risk for multi-tenant SaaS apps, where customer-specific domains, migrations, and manual console updates can trigger login failures or misconfigurations, according to WorkOS. Exact matching reduces one attack surface, but it shifts the burden to disciplined URI lifecycle management and safe proxy patterns.
Editorial analysis by NHI Mgmt Group, based on content published by WorkOS: “Google OAuth's strict redirect URI matching: A guide for multi-tenant apps”.
Key questions
Q: What breaks when redirect URIs are not registered before a tenant migration?
A: Login flows fail with redirect_uri_mismatch, and users experience what looks like an authentication outage even though the real issue is registration lag.
Q: Why does exact-match redirect handling increase operational risk for SaaS teams?
A: Exact matching is strict by design, so every domain, path, and trailing slash must stay aligned across code, DNS, and console configuration.
Q: How should teams decide between a proxy callback and per-customer OAuth clients?
A: Use a proxy callback when you want a smaller global registration surface and can secure state handling tightly.
Practitioner guidance
- Define redirect URI lifecycle ownership Assign a named owner for registration, cutover approval, and retirement of OAuth redirect URIs across customer tenants.
- Canonicalize callback construction Build redirect URIs as constants and keep scheme, host, port, and path identical to the registered value in Google Cloud Console.
- Use coexistence windows for domain migrations Keep old and new redirect URIs registered at the same time until active sessions have drained and the new path has been verified end to end.
Bottom line: Google’s exact-match redirect URI policy reduces one class of OAuth abuse, but it shifts the hardest risk into configuration lifecycle management.
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04/06/2026 7:05 pm
Redirect URI governance is now identity lifecycle management, not app wiring. The operational burden in this pattern comes from registration, cutover, coexistence, and retirement, which are lifecycle tasks familiar to IAM teams. When those steps are manual, each tenant migration becomes a control event rather than a deployment detail. The practitioner conclusion is simple: treat redirect URI change control like any other identity lifecycle process.
A few things that frame the scale:
- Security researchers tracked consent phishing campaigns affecting 900 tenants and 3,000 user accounts in 2025.
A question worth separating out:
Q: When is it safe to remove an old redirect URI after migration?
A: Only after the new URI is confirmed working, the old path is no longer receiving sessions, and your logs show no remaining dependency on the previous domain. Removing it too early can break in-flight logins. The safest approach is to keep both URIs active through the full transition and retire the old one with documented approval.
👉 Read our full editorial: Google OAuth redirect URI strictness in multi-tenant apps