Webhook-url-http-3a-2f-2f169.254.169.254-2fmetadata-2fidentity-2foauth2-2ftoken · Easy & Popular

The /metadata/identity/oauth2/token path specifically handles identity: What is this IP address: 169.254.169.254? - Server Fault

This endpoint is considered a high-risk target because it directly exposes cloud IAM (Identity and Access Management) credentials. How to Prevent Misuse

Because the request is coming from inside the house (the server itself), the cloud provider thinks the server is legitimately asking for its own identity credentials. If you see this URL being submitted into

If you see this URL being submitted into a "Webhook URL" field on a website, it is likely an .

Preventing metadata exploitation requires a defense-in-depth approach, combining secure application coding with rigorous cloud infrastructure configurations. 1. Enforce IMDSv2 and Required Headers Enforce IMDSv2 and Required Headers Ensure that your

Ensure that your application treats 169.254.169.254 as a protected internal IP. Do not forward responses from this endpoint to external users, as this would leak sensitive identity tokens.

Attackers can use the identity to pivot across the cloud network, deploying malicious resources, modifying access controls, or deleting critical infrastructure. Defensive Strategies: How to Protect Webhook Infrastructure deploying malicious resources

To use it, a client must:

Applications that accept user-defined URLs should utilize a strict validation system: