The string you provided is a URL-encoded representation of a specific HTTP request path. When decoded, it translates to:
: If an application allows a user to provide a URL (like a callback or webhook) and then fetches that URL from the server side without validation, an attacker can input the internal 169.254.169.254 address. The string you provided is a URL-encoded representation
Thus, finding this exact encoded string in your logs or exploit payloads suggests an attacker is actively probing for metadata service exposure. it points to: http://169.254.169
The string callback-url-http-3A-2F-2F169.254.169.254-2Flatest-2Fmeta data-2Fiam-2Fsecurity credentials-2F is a URL-encoded payload. When decoded, it points to: http://169.254.169 The string you provided is a URL-encoded representation