---
id: 1335
title: "How Inadequate Authentication Logic Led to an MFA Bypass and Account Takeover"
source_domain: hackerone.com
source_url: "https://www.hackerone.com/blog/how-inadequate-authentication-logic-led-mfa-bypass-and-account-takeover"
published_at: "2024-11-20 17:49"
tags: ["bug-bounty", "account-takeover", "web-security", "authentication", "best-practices", "mfa", "session-management"]
phying_url: "https://phying.com/item/1335"
lang: en
---

# How Inadequate Authentication Logic Led to an MFA Bypass and Account Takeover

## Summary

An MFA bypass bug found via HackerOne issued a session token before MFA verification, enabling account takeover. The post dissects the flaw and shares authentication best practices.

## Intelligence Metadata

- **Sources:** hackerone.com
- **Published:** 2024-11-20 17:49
- **Original:** https://www.hackerone.com/blog/how-inadequate-authentication-logic-led-mfa-bypass-and-account-takeover
- **Phying News:** https://phying.com/item/1335