callback-url-file:///proc/self/environ

: Ensure your HTTP client libraries (like cURL or requests) are configured to only allow Are you seeing this in server logs , or are you currently testing an application for vulnerabilities?

: A URI scheme that directs the application to access files on the local file system rather than a remote web resource.

: Ensure you have explicit authorization to test the system, use controlled environments, and follow responsible disclosure.

Check server logs (e.g., Nginx access logs ) for similar patterns to identify the scale of the attempt. Additional Resources

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