Webhook-url-http-3a-2f-2f169.254.169.254-2fmetadata-2fidentity-2foauth2-2ftoken

http://169.254.169.254/metadata/identity/oauth2/token

GET /metadata/identity/oauth2/token?api-version=2018-02-01&resource= https://management.azure.com/ HTTP/1.1 Host: 169.254.169.254 Metadata: true

When decoded from URL encoding ( %3A = : , %2F = / ), it becomes: http://169

This specific string represents a Server-Side Request Forgery (SSRF) attack pattern targeting Azure Instance Metadata Service (IMDS)

This article explores what this specific URL does, why it is a prime target for security attacks, and how to defend against threats. What is http://169.254.169.254? Treat any webhook or callback that uses this

Warning: the IP 169.254.169.254 is a well-known link-local address used by many cloud providers (including Azure, AWS, Google Cloud) to expose instance metadata and identity/token services. Treat any webhook or callback that uses this address as highly sensitive: it can be used to obtain credentials or tokens for the VM or container hosting the service. The following deep text explains risks, attack techniques, detection, mitigation, and secure design patterns.

The IP address 169.254.169.254 is a special IPv4 link-local address reserved for cloud environments. Major cloud providers—including Microsoft Azure, Amazon Web Services (AWS), and Google Cloud Platform (GCP)—use this specific IP address to host their Instance Metadata Service (IMDS). or security alerts

Regularly audit the Azure Managed Identities assigned to your compute resources. Ensure that a virtual machine hosting a public-facing web application only possesses the absolute minimum permissions required to perform its function. Never grant a web-facing server broad database or subscription-level administration privileges. Conclusion

If the VM has multiple identities, you can specify the client_id or object_id in the API call to request a token for a specific user-assigned identity.

Which (Azure, AWS, or GCP) hosts your application?

If you have ever come across a string like webhook-url-http-3A-2F-2F169.254.169.254-2Fmetadata-2Fidentity-2Foauth2-2Ftoken in your logs, application configurations, or security alerts, you are looking at a classic sign of a targeting cloud metadata services. This seemingly harmless URL-encoded string is, in fact, a weaponized payload that attackers use to steal cloud access tokens.