Move sensitive credentials out of environment variables and into secure secrets managers like HashiCorp Vault, AWS Secrets Manager, or Kubernetes Secrets.

The attacker changes the parameter to ?page=../../../../proc/self/environ .

In the landscape of web application security, especially within Linux-based environments, the combination of and misconfigured callback URLs can lead to devastating consequences. A specialized, high-impact variant of this attack involves navigating to file:///proc/self/environ , often rendered in malicious traffic logs or URL parameters as file-3A-2F-2F-2Fproc-2Fself-2Fenviron (due to URL encoding of the : and / characters).

If the application mishandles this as a and tries to read from it (e.g., using file_get_contents , curl , open without proper validation), the attacker may be able to read environment variables from the server process.