The encoded form webhook-url-http-3A-2F-2F169.254.169.254-2Fmetadata-2Fidentity-2Foauth2-2Ftoken is dangerous for several reasons:
: The specific path used to request an access token from the local identity service. Are you performing a security audit or attempting to configure a service that requires cloud identity access?
An attacker exploits this vulnerability through a systematic multi-step process: The encoded form webhook-url-http-3A-2F-2F169
It is not possible to write a meaningful, safe, or ethical long-form article targeting the exact keyword string you provided:
The string http-3A-2F-2F169.254.169.254-2Fmetadata-2Fidentity-2Foauth2-2Ftoken is a URL-encoded version of a standard Azure IMDS path. The string you provided is an
The string you provided is an .
This specific path is unique to Microsoft Azure. It is the endpoint used by Azure Managed Identities. When a VM requests this URI, the local metadata service returns an Azure Active Directory (Azure AD / Entra ID) OAuth2 access token matching the identity assigned to that specific VM. How the Webhook Exploitation Works When a VM requests this URI, the local
If the server doesn’t add the required Metadata: true header, the IMDS will reject the request (Azure requires it). But many SSRF attacks can still succeed if the server includes default headers – some HTTP libraries automatically add Host , User-Agent , and sometimes even forward custom headers.
Always restrict the roles assigned to the managed identity to the minimum necessary actions (Principle of Least Privilege).
Understanding the SSRF Risk: Demystifying the 169.254.169.254 Webhook URL
/metadata/identity/oauth2/token This specific endpoint is used to request access tokens for Azure resources. If accessed with the correct headers (specifically Metadata: true ), Azure returns a JSON response containing an access_token . An attacker who retrieves this token can use it to authenticate to Azure services (like Key Vault, Storage, or SQL) as that virtual machine.