Learn and Earn with the Most Common Unsecured Methods of OTP Bypass Techniques: Unpacking the Pitfalls

Discover the ultimate guide for bug bounty hunters to detect sneaky OTP validation vulnerabilities!

4 min readJul 11, 2023



As the digital world expands, so does the importance of cybersecurity. One Time Passwords (OTP) have become increasingly popular in the realm of authentication. They are known for providing an extra layer of security, making it difficult for hackers to gain unauthorized access. However, if not properly implemented, OTP validation can leave a system open to various security risks. Let’s explore six of the most common unsecured methods of OTP validation.

1. OTP Leakage in Response

When the application back-end system generates an OTP, it’s crucial that this information remains confidential. One common insecure practice is when the OTP leaks through server responses. This can happen when the OTP, once generated, is included in HTTP responses, logs, or error messages that can be intercepted by attackers. Ensuring OTPs are kept hidden in responses is key to maintaining their integrity and confidentiality.

OTP is disclosed in Response