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

If a web application on the instance makes HTTP requests based on user input (e.g., fetch(user_provided_url)), an attacker can supply http://169.254.169.254/latest/meta-data/iam/security-credentials/ and steal the instance’s IAM keys.

Classic example:
A image-processing service that lets users provide a URL to fetch an image. The server blindly fetches the URL — and the attacker gives the metadata endpoint.

The URL provided refers to the AWS EC2 Instance Metadata Service (IMDS). Purpose and Function

This specific endpoint is used to retrieve temporary IAM security credentials for the IAM role assigned to an EC2 instance.

IP Address: 169.254.169.254 is a link-local address accessible only from within the instance.

Data Access: Accessing this path typically returns the name of the IAM role. Appending that role name to the URL (e.g., .../iam/security-credentials/) provides the access key, secret key, and session token. Security Context

This request is often associated with Server-Side Request Forgery (SSRF) attacks. In such scenarios, an attacker tries to trick a vulnerable web application into fetching these credentials to gain unauthorized access to the cloud environment. IMDSv1: Allows direct access via a simple GET request. If a web application on the instance makes

IMDSv2: A more secure version that requires a session token obtained through a PUT request before metadata can be queried.

If you're looking to secure your instance, you can find best practices on the AWS IAM Security and EC2 Instance Metadata pages. Wiz x Cloud Security Championship: Perimeter Leak

The Instance Metadata Service (IMDS) endpoint, specifically the 169.254.169.254 path, acts as a critical vulnerability, allowing attackers to leverage Server-Side Request Forgery (SSRF) to steal temporary IAM security credentials. To mitigate this risk, security best practices demand enforcing IMDSv2, implementing strict IAM least-privilege roles, and utilizing network-level blocks. Read the full technical breakdown at Medium.

The requested URL is a critical endpoint within the AWS Instance Metadata Service (IMDS) used by EC2 instances to retrieve temporary security credentials. The presence of this specific string—often seen in logs or security alerts—frequently indicates an attempt to exploit a Server-Side Request Forgery (SSRF) vulnerability. What is this Endpoint?

The URL http://169.254.169.254/latest/meta-data/iam/security-credentials/ is a link-local address accessible only from within an EC2 instance.

Function: It allows applications running on the instance to "learn about themselves". The requested URL is a critical endpoint within

IAM Integration: If an IAM Role is attached to the instance, this endpoint lists the name of that role.

Credential Retrieval: By appending the role name to the URL (e.g., .../security-credentials/MyRoleName), a user can retrieve an Access Key, Secret Key, and Session Token to perform actions authorized by that role. Security Implications & SSRF

Because this endpoint returns sensitive credentials without requiring an initial password, it is a primary target for attackers.

The Attack: In an SSRF attack, an attacker "tricks" a vulnerable web application into making a request to this internal URL on their behalf.

The Goal: The attacker aims to steal the temporary credentials, which can then be used from outside the AWS environment to gain unauthorized access to your cloud resources, such as S3 buckets or other EC2 instances. IMDS Versioning:

IMDSv1: Vulnerable to simple SSRF because it uses standard HTTP GET requests. AWS has released IMDSv2 specifically to mitigate this

IMDSv2: Protects against SSRF by requiring a session token obtained via a PUT request, which standard SSRF vulnerabilities typically cannot perform. Steal EC2 Metadata Credentials via SSRF - Hacking The Cloud

Stealing IAM Credentials from the Instance Metadata Service * To determine if the EC2 instance has an IAM role associated with it, Hacking The Cloud

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

This is a well-known and highly sensitive internal endpoint used by cloud providers, specifically Amazon Web Services (AWS) EC2 and similar services (like Google Cloud, Azure IMDS, or OpenStack).

Below is a long-form, in-depth article about this endpoint: what it is, why it exists, the security risks, how attackers exploit it, and how to protect against it.

AWS has released IMDSv2 specifically to mitigate this SSRF vector.