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

Do you currently use an or Web Application Firewall (WAF) ?

What or framework powers your webhook system?

It allows an application running on a VM to securely retrieve information about its environment (e.g., VM size, network configuration, public keys) without needing to authenticate with a username or password. Do you currently use an or Web Application Firewall (WAF)

Always validate user input in your application to prevent the application from making unauthorized requests to internal network endpoints. 5. Alternatives

METADATA_IP = ip_address('169.254.169.254') if ip_address(parsed_url.hostname) == METADATA_IP: raise ValueError("Blocked SSRF attempt to metadata service") Always validate user input in your application to

) to block the web application's user ID from making any requests to the link-local address 169.254.169.254 Resecurity Python script example

The IP address 169.254.169.254 is a link-local address, meaning it is only accessible from within the virtual machine (VM) and never leaves the host network. 1. What is the IMDS Token Endpoint? When a specific event occurs

Modern cloud applications rely heavily on webhooks to automate real-time communication between different software systems. When a specific event occurs, a web application sends an automated HTTP request to a URL specified by the user. While this feature creates seamless integrations, it also introduces one of the most critical security vulnerabilities in cloud computing: Server-Side Request Forgery (SSRF).

This article explores the mechanics, use cases, and security implications of using the endpoint to acquire OAuth2 access tokens, specifically via the URL format often utilized in webhook configurations: http://169.254.169.254/metadata/identity/oauth2/token .