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

http://169.254.169.254/metadata/identity/oauth2/token is a sensitive endpoint within the Azure Instance Metadata Service (IMDS) used to retrieve OAuth2 access tokens for a virtual machine's Managed Identity

Summary

If you are developing a feature: 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. http://169

Webhooks are designed to send data to a URL provided by a user. The danger arises when an application takes that user-supplied URL and blindly makes a request to it. Block outbound traffic to 169

Enforce Headers: Azure IMDS requires a specific header: Metadata: true. Most SSRF attacks fail if your server doesn't automatically include this. http://169

3. Impact Assessment

| Severity | High/Critical | | :--- | :--- | | Confidentiality | High Risk. Exposure of cloud credentials (Managed Identity tokens). | | Integrity | Medium Risk. Stolen credentials could allow modification of cloud resources. | | Availability | Low Risk. Potential for resource deletion using stolen credentials. |

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1. Patch SSRF Vulnerabilities

• Block outbound traffic to 169.254.169.254 from the application tier, unless explicitly required by the application logic.
• On Azure, consider using IMDS Firewall (Instance Metadata Service configuration) to restrict access only to specific allowed routes or disable it if not needed.