This simple Rate Limit Bypass Worth $200 |

Описание: I demonstrate a critical Rate Limit Bypass vulnerability discovered on BlancVPN (api.blancvpn.app). By leveraging Email Sub-addressing (also known as the "plus (+) trick" in Gmail), I show how an attacker can systematically circumvent the platform's authentication and invitation restrictions to send unlimited OTPs or duplicate requests to a single inbox.

This walkthrough covers the technical root cause (improper string normalization on the backend) and the real-world security impact, including mail bombing and infrastructure resource exhaustion.

🛡️ What You Will Learn
How the application's base rate limiter behaves under normal conditions.

The mechanics of Email Sub-addressing and why loose backend string matching fails to stop it.

A live demonstration of the vulnerability step-by-step using Burp Suite.

Industry-standard remediation techniques to fix this flaw on the backend.

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⚠️ Disclaimer
This video is uploaded for educational and security research purposes only. The vulnerability shown has been properly documented and reported to the platform's security team for remediation. Do not attempt to test target infrastructure without explicit, authorized permission and safe-harbor guidelines.

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