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

Search your application, proxy, and VPC flow logs for any GET requests to 169.254.169.254 . An immediate alert should fire if this is discovered from an unexpected source.

: This updated version requires a session-oriented "token-based" approach. An attacker cannot simply perform a GET request; they must first perform a PUT request to get a token, which most SSRF vulnerabilities cannot do. You can find migration guides on the AWS Documentation page. Search your application, proxy, and VPC flow logs

The URL http://169.254.169 is a signature of a Server-Side Request Forgery (SSRF) attack targeting AWS Instance Metadata Services to steal IAM credentials [1]. Attempting to fetch this URL can leak sensitive server credentials, leading to full cloud environment compromise [1]. Immediate remediation requires blocking the request, migrating to IMDSv2, and implementing input validation to deny access to the 169.254.169.254 address, as detailed by AWS documentation. An attacker cannot simply perform a GET request;

: Ensure application "callback" fields do not allow private or link-local IP ranges (like 169.254.x.x or 10.x.x.x ). Attempting to fetch this URL can leak sensitive

By understanding the significance of callback URLs, such as http://169.254.169.254/latest/meta-data/iam/security-credentials/ , developers and administrators can build more secure and scalable applications, ensuring the integrity and confidentiality of data exchanged between parties.

The security community has long recognized the danger of "open" metadata access. Historically, relied on a simple GET request, which made it highly susceptible to SSRF because many application vulnerabilities (like basic URL redirects) could easily trigger a GET call.