Callback-url-file-3a-2f-2f-2fhome-2f-2a-2f.aws-2fcredentials -

scheme, an attacker can bypass traditional network filters to access the local filesystem of the server running your code.

Replace YOUR_ACCESS_KEY_ID , YOUR_SECRET_ACCESS_KEY , etc., with your actual AWS access key IDs and secret access keys. callback-url-file-3A-2F-2F-2Fhome-2F-2A-2F.aws-2Fcredentials

This decoded URL appears to point to a file path on a local machine, specifically: scheme, an attacker can bypass traditional network filters

Connect this to an AWS Lambda function that performs the action (e.g., posting to a database or social media). protocol to trick an application into reading local

protocol to trick an application into reading local files instead of fetching a remote URL. If the application has enough permissions, it may return the contents of the AWS credentials file, exposing: Access Key IDs Secret Access Keys Session Tokens 🛡️ How to Protect Your Infrastructure Validate Protocol Schemes : Only allow for callback URLs. Explicitly block Use an Allowlist

: Decodes to /home/*/.aws/credentials .