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Google Cloud Run 403 Forbidden on Public Webhook Endpoints

VERIFIED WAYPOINT ⚡ Saves ~36,000 tokens ($0.13) Category: Cloud & Containers

🎯 Target Goal & Friction

Goal: Allow unauthenticated public invocations on Cloud Run service

Error Signature: 403 Forbidden: Your client does not have permission to get URL / from this server

⚡ Direct Teleport Deep Link (0ms Navigation)

https://console.cloud.google.com/run/detail/{region}/{service}/security →

Agents skip UI exploration menus by navigating directly to this endpoint.

Verified Code / Configuration Diff

@@ Cloud Run Security IAM @@
+ Add Principal: allUsers
+ Role: Cloud Run Invoker

1-Line Instant CLI Fix

gcloud run services add-iam-policy-binding {service} --member="allUsers" --role="roles/run.invoker"

Root Cause & Explanation

Cloud Run services default to authenticated-only access. Public APIs and webhooks require granting the `Cloud Run Invoker` role to `allUsers`.