Callback-url-http-3a-2f-2f169.254.169.254-2flatest-2fmeta Data-2fiam-2fsecurity Credentials-2f May 2026

When you launch a virtual server (an EC2 instance) in AWS, you often need that server to perform actions—such as uploading files to S3 or writing logs to CloudWatch. To do this, the server needs permissions.

Rather than hard-coding permanent access keys onto the server (which is a major security risk), AWS provides the IMDS. This is a service running on every EC2 instance accessible only from within the instance itself. It provides information about the instance, such as its ID, IP address, and crucially, the IAM role attached to it. When you launch a virtual server (an EC2

If an attacker gains code execution on a cloud VM—via a vulnerable web app, SSRF (Server-Side Request Forgery), or a compromised dependency—their next immediate step is almost always: "Check if the instance has IAM credentials at

"Check if the instance has IAM credentials at the metadata endpoint." The URL provided is a critical component in

The URL provided is a critical component in the AWS ecosystem, enabling secure, dynamic access to AWS resources for EC2 instances. By leveraging the Instance Metadata Service, applications on EC2 instances can obtain necessary credentials to interact with AWS services securely. This approach aligns with best practices for managing access and minimizing the exposure of sensitive credentials.

http://169.254.169.254/latest/meta-data/iam/security-credentials/

This URL is used in the context of AWS EC2 instances to fetch temporary security credentials. Here's a helpful text explaining what this URL is used for and how it works: