This article provides a comprehensive overview of fetching service account tokens from the , specifically focusing on the endpoint: http://google.internal .

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– When creating a VM, you can limit which APIs the metadata token can access (e.g., read-only for Cloud Storage, no Compute API). Even if your app is compromised, the token has minimal permissions.

The log wasn't just an error message. It was a crime scene photo. It showed that someone had tried to trick the server into revealing its internal identity. They had tried to access the service accounts.

Suppose your VM needs to impersonate a different service account (e.g., to access a project that the VM’s own account doesn’t have permission for). You can use the metadata server to get a token that can be exchanged for a token of the target account using the IAP or IAM signJWT endpoints.