Callback-url-file-3a-2f-2f-2fproc-2fself-2fenviron

This is a form of via custom schemes, especially if the app uses a handler like:

In an LFI vulnerability, an application uses input parameters to locate local templates or configuration documents. Passing file:///proc/self/environ forces the script engine to read the process memory file. If the system logs are also configured to display these environment inputs, an attacker can use this vector to inject malicious code and achieve Remote Code Execution (RCE). What Can an Attacker Steal? callback-url-file-3A-2F-2F-2Fproc-2Fself-2Fenviron

On Linux systems, the /proc directory is a virtual file system that provides an interface to kernel data structures. It doesn't contain real files, but rather information about system processes. This is a form of via custom schemes,

When an attacker inputs this string into a vulnerable web application, they are attempting to force the server to read and display its own internal environment variables. Encoded Version (Common in Logs) Decoded Meaning %2E%2E%2F%2E%2E%2F ../../ (Navigating up directories) Path %2Fproc%2Fself%2Fenviron /proc/self/environ What Can an Attacker Steal

file_get_contents("file:///proc/self/environ")

send_callback()